I have been sitting on a MAGNAFLOW dual in/out internal x-pipe muffler to replace the rear cats. I will not replace the downpipes with the downpipes Rob sells. I know some of the guys and gals have used this muffler. I then will put the MAGNAFLOW "Y" to bring the dual outlets to a single 3" outlet which will allow for the elimination of the resonator taking the spent gasses into a BORLA PRO XS muffler that has a single 3" in/out muffler. Finding a nice tip to fit the single outlet is important to me and may even use one that quiets the exhaust even more. Possibly put a short round (5")? muffler between the "Y" and the BORLA. I had hoped to try/test Rob's log headers but expense put a damper on that for now.
Would anyone with experience tell me if I can expect a gain of 20wtq/15-19wtq with these mods tuned on a dyno as I never measured the gains from the other engine mods I have for what the car is making from these mods. Hoping for 20RWHP/15-18RWTQ. Likely expectations? Thanks, mark

 

Don't see how a increase in performance when you are taking out the resonators and installing the magna muffler and another borla pro xs at end and looking at another inbetween, would be more restrictive. Might be a loss in power.

If something is going to be happening anyway.
You have the magna flow now, take the resonators out as you want and install the dual in / out MagnaFlow then listen to the sound before you add any more (in building and with the short exhaust will be louder than finished out back) if to loud for you get a cheap set of resonator exhaust tips, and would tone down more.
And can do dual 2.25 back if you like the sound, be less restrictive, eliminates that sharp bend in pipe around rearend to the muffler.

Give us sound clips please on each stage.

 

No problem with updates along the way as that is what these forums are about, offering what mods did what. All of the mufflers I have are straight thru with perforated insulation, little to no HP loss and that is certain. It is the muffler types like PYPES and the popular Flowmasters that offer restrictions. Borla's have been tested and make the most low end torque than any other muffler, I have researched. Thanks, more to come soon! Mark

 

By the way the Borla makes more HP than a straight pipe. Straight thru mufflers that are perforated have minimal loss of power if at all. Ones like the horrible Flowmasters with their baffles hurt power but guys seem to like their obnoxious sound. PYPES are terrible also. had a set and took them right off. I have reasd where the borla's help loe end torque and torque is more important to HP for me. Thanks

 

The Magnaflow TRU internal x-pipe dual in/out muffler replaces the rear cats TODAY with a Magnaflow two into one "Y" pipe following it, resonator delete with the Borla Pro XS muffler out back if i can find a 3" chrome downturned tip, tip or not, I will polish the Borla whiuch is stainlkess. Report to follow later today! Mark

 

Woohoo, the day has come, gl, will be checking up.

 

Only a few hours until we get to hear (again) how V-8 exhaust theories don't work for the XF.....

 

.... and also look forward to hearing about "no drone", resonance issues. You can't claim a system doesn't drone until it's completed and tested. R.P.M. range approx. 1,800-2,500 is the tough range for manufacturers to eliminate the bad frequency. I read that the Borla uses noise cancelling design better than most, so hopefully all works out well.

 

More power to you for finding out for yourself. I've been doing some research and have a few ideas to try myself. If I ever get off my lazy _ss.

Les

 

How did the exhaust turn out?

 

I am scheduled for Monday morning. I've had the mufflers & "Y" sitting in a closet for some time now. If I drop .15 I will have to be pleased. Chuk, if you are talking about the drone issue I learned about the Borla's when working with Chrysler Conquests, one of the finest quality cars I have ever owned. I was told the hookers also do not drone. I and a few friends have used the Borla's with success, no drone and you are right, drone always occurs right in the rpm range where we cruise. I have used PYPES-took right off and sold, terrible. Flowmasters are junk baffled mufflers and good resonators are simply baffled boxes. I am old enough to have owned many V8 muscle cars including 5 Buick GS cars from a rare '67 340 to a few 455's. By the way Motor Trend tested the '70 Buick Stage 1 and it was the quickest muscle car they tested that year including the LS-6 460HP 454 Chevelle SS. Probably the one that would be worth the most now was a '69 Dodge R/T 440 4-speed drop top.
The quickest car I owned was a 2 liter Eagle Talon, no V8! Stutterstep launch at 10psi at 4750rpm netted the best 60' on street tires, a 1.68. 1/4 mile in 11.68 at 122mph. That car had 10 second capabilities (TURBO)from 122 cubes. That 2 liter was close to 500rwhp. Shifted at 8500rpm and bounced off the 9k rev limiter many a time and the builder, David Buschur, claimed it was good for 10,000rpm. Yes, I owned a Mustang with the 4v SC motor that put 440/440 to the wheels but I bought it tuned and did nothing to the motor but you seem to not want to let that car go. It was a crude car and nothing like the AMG I enjoy so much now. I have owned more turbo cars than V8's by a long shot. My first car I drove when I was 20 years of age was an 8 cylinder, a straight 8 in a '39 Buick Special!
I don't know what gave you the hard on but we once were almost friends with you offering to help with my car. I have had 4 back surgeries and need 2 more with a bleak future as far as that goes but I will make the best of it. Is it against the rules to say I am a Christian? I still hope to meet you and perhaps we can spend some time tuning my car as I have several to choose from.
I am looking for a 17 x 8" rear wheel with a 6.25-6.35" backspacing if anyone knows of one.

I'll be sure to give an honest assessment of the system I have chosen to try to coax the most power from a V6 motor and it's offbeat exhaust pulses.
Les, I would recommend that you add 18" extensions to the collectors of the long tubes you have with an x-pipe in that 18" section if there is room, you may find some of the power you have lacked with that system, couldn't hurt?

 

dinasrt, the Borla model that works is the Pro XS which once carried the Turbo name which they dropped. I and several friends have used these mufflers on many vehicles with 4 cylinders to the dreaded V8's! Trivia: Turbo mufflers started out on the Chevy Corvair Turbo model, 1969 being the pinnacle year and a rare car.

 

I get tired of repetition, like reading about those pipes in almost every post. Or reading multiple threads asking the same question then saying a service isn't worth the cost without buying it. You got 5 tunes for the price of 1 and still complain you haven't gotten what you wanted. I gave you sound advice, you chose not to follow it and continued to ask the same question. Like I said....I get tired of repetition.

 

You didn't get what I was saying apparently. Just because the Borla worked(without drone) for you and your friends on other vehicles, doesn't mean it's going to not drone on this car. For the record, I am quite happy with my system. I believe it's because I kept the OEM resonator(as many here on the forum have advised). And after the N.W.'s downpipes, used a Magnaflow tru-x crossover pipe in place of the factory H-balance tube. My Magnaflow SRT6 resonator back muffler sounds great IMO. No dynos for me at this time, but it sure feels like 20whp(or maybe it just sounds like 20whp). If it was a track only car, then I might drop the heavy resonator and wear ear plugs. When you get your system completed and it doesn't drone somewhere between 1800-2500 RPM; then I will be happy for you. Then again, perhaps you don't care about a little drone. I'm certain that the AMG boys had to work hard on that resonator to cancel the bad frequency(apparently between 133-138Hz for those that may be interested. lol) I admire all the guys and vendors here on the Forum who have pushed the limits(and spent a lot of money), and figured this stuff out. Compared to them, I'm just a follower here(and like them, I too have spent a lot of money).

 

I got what you meant, just feel confidant. I too am using the Magnaflow x-pipe muffler(A very nice piece by the way), deleting the resonator and replacing the nice stock muffler with the Borla. I'm keeping all of the stock pieces intact so they can be used if I don't like the system I am trying. I have poor hearing and sounds like the drone of a poor exhaust system actually hurts my ears.
Jerry has been very cordial making recommendations for parts(the 550cc injectors) to enhance the tunes he has provided. Chuk I have reached out to you to be friendly and offered to pay you for services and at first we had a nice common ground relationship and I believe it was the mention that a tune is nothing more than air/fuel and ignition timing that got you "upset"? Why can't we shake and let bygones be just that? I'm looking forward to a pic of us shaking hands after my AMG routs your X-fire, head to head! LOL just joking Chuk. I have the utmost respect for your work as your expertise precedes you. All I have done myself is change the valve cover gaskets, injectors and the DCAI. I was likely disabled at your age.
I'll give a fair report on the catback when it is complete. My one concern was going with a 3" in/out Borla as a larger pipe will enhance the drone and many V8 guys go overkill with 3" exhaust systems.

 

Reading the responses they are for the most part critical. Thought this forum was to enhance the driving experience of these unique auto's. I am not doing the first M TRU X as a muffler per say but as a way to get the uneven V6 exhaust pulses to flow in an even fashion, it's about getting some torque and not so much noise reduction. Jim, Jefasold, felt that his research showed a "Y" pipe did what I am trying to achieve, as Jim has, building torque. A resonator built properly is like a Flowmaster, chambered though I am sure Mercedes did a lot more than a Flowmaster ever did. My hope is for the "X" to even the pulses of the V6, the 3" piping to flow well into the Borla to finish the quieting the engine's exhaust in a free flow fashion. Tomorrow is the day. I would have liked to have used a set of Rob's log headers, even unproven because of the extra flow they offer but I could not afford them so what I can achieve with research and V6 motors will have to suffice and I will give results tomorrow afternoon.

 

Did someone mention "repeat" stories? Don't worry.. several have played "this" game.

 

There's a big difference between an X-"pipe"(what I am using) and an "x-pipe muffler" as you have said you are using. Taken literally, you are proposing to use (2) mufflers; a Magnaflow x-pipe muffler in place of the rear cats. And the Borla muffler out in back. Is this correct?

 

Guess he failed to mention there was money involved. And it wasn't enough for me to bother with for the drive involved. Here you are failing to mention that I've helped you out twice. With absolutely no want or need for your friendship. But you always fail to mention that. Go troll somewhere else since you have absolutely nothing to add to this conversation, hell, this subforum. Find a bridge....

 

You have no idea how close I was to bringing you a headlight bulb clip at the Dragon. But I didn't want your drama from it that we all know would have happened.. Care to inform me of your "twice" claim.. I missed that second great big favor that means you own my soul. Unfortunately you feel a need for a "I helped tally sheet".. unlike most of us who help out and don't think twice about it.