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Discussion Starter · #1 ·
OK so i just got my 06 gto back (6 speed) and OH WOW ITS LOUD LOL!!! But the car used to feel VERY powerfull and snapped ur head back. now it almost feels sluggish, like its bogging, How can i keep my straight pipes but regain the lost power? i guess its low backpressure thats causing it
Thanks!

Paul Fay
 

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Just keep the stock catback and get some cutouts for it! You'll lose some low end torque but you usually pick up some power up top, thats the trade off.
 

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paulboy2006 said:
OK so i just got my 06 gto back (6 speed) and OH WOW ITS LOUD LOL!!! But the car used to feel VERY powerfull and snapped ur head back. now it almost feels sluggish, like its bogging, How can i keep my straight pipes but regain the lost power? i guess its low backpressure thats causing it
Thanks!

Paul Fay
I don't know why so many people want straight pipes. all you get is noise. to me an exhaust should compliment the sound of the engine, not just make a bunch of noise so you can't hear the engine sing
 

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1969 SS said:
I don't know why so many people want straight pipes. all you get is noise. to me an exhaust should compliment the sound of the engine, not just make a bunch of noise so you can't hear the engine sing
Amen to that, but to each their own.
 

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1969 SS said:
I don't know why so many people want straight pipes. all you get is noise. to me an exhaust should compliment the sound of the engine, not just make a bunch of noise so you can't hear the engine sing
That is so true. They both should sing in their own but complementary song. There should be that wonderful mechanical harmony. :)
 

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You want a better sound but it should give performance gains as well! That is something most of the aftermarket catbacks are lacking. I have seen a few dyno's where they get a mild increase but most of the time for the average buyer its not worth it.
 

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i know what you mean... I have been running open headers for the past two weeks because I am having a custom 3 inch catback on and it is driving me crazy the noise and the apparent lose of power
 

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Nemisis said:
You want a better sound but it should give performance gains as well! That is something most of the aftermarket catbacks are lacking. I have seen a few dyno's where they get a mild increase but most of the time for the average buyer its not worth it.
Except for the fact that the stock system is heavy and junk.

Between the stock chambered mufflers and pinched pipes, even if minimal, there must be some gains (2hp?) to be had with a quality straight through catback system.

Besides, we all know the real gains are to be had with LT's and Mids.
 

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paulboy2006 said:
OK so i just got my 06 gto back (6 speed) and OH WOW ITS LOUD LOL!!! But the car used to feel VERY powerfull and snapped ur head back. now it almost feels sluggish, like its bogging, How can i keep my straight pipes but regain the lost power? i guess its low backpressure thats causing it
Thanks!

Paul Fay

I think it's all in your head... Even if it lost _any_ HP, from what I've seen/read you would be looking at 5hp or less, and I'd bet money you can't feel 5hp of difference....
 

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Two things, it's a matter of opinion on what sound you want and for the slow start...??? That happened when I put my k&n aircharger on, all I can tell is that it has a deep throat tone.
 

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Discussion Starter · #11 ·
Well i remeber being jerked in my seat (sounds bad huh?) lol but now it dusnt, still feels like a monster LOL!! the thing i dont like is the terrible popping when downshifting and coming to a stop... why dus it pop??!! When u deaccelerate it DUSNT POP, only dus it after a downshift... tune will fix? I just dont down shift at the moment. I already got 2 compliments "best sounding gto ever" " wow thats awesome, i could hear u a mile away, nice pipes man"

So in all im very pleased... i just wish it felt like it did before but MAYBEE it was in my head!

I was thinking about throwing on some glass packs... any thoughts?

Paul
 

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The only pipes I've seen pinched is where it crosses under the rear shafts if I remember right?!? Thats why I opted to just get cutouts, I liked the stock catback sound with the longtube/off road pipe combination, with resonator delete, now with the 402 its pretty loud no matter what:D
 

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I had my mufflers deleted today and wow I love the sound very loud but not too loud when crusing on the highway at 80 in 6th. I dont really feel a power loss low end but I feel a slight pickup top end so I'll take it. Also the car sounds almost identical )for some reason?) to my roommates 02 WS6 with longtubes no cats and slp LM1 catback. I find this interesting.
 

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Also, do you think there is enough back pressure with the cats still there?
 

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Discussion Starter · #15 ·
Well i changed my mind, i think its in my head, car performed awesome today after the first ride (it was REALLY hot when i picked up the car, almost 96. and it rained earlier after i got it and it came down to like 75 so that was the problem. my car is EXTREMELY quiet ont he highway at 75-85.. almost like stock (witht he windows closed) so i dunno why thats soo different?

Paul
 

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Mizat1369 said:
Also, do you think there is enough back pressure with the cats still there?

more than enough.
 

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You will not lose torque because you deleted the mufflers! Backpressure will only hurt power output. If you reduce backpressure and you actually do "measure" a loss of power then it is because the A/F ratio is no longer optimum... that's it.
 

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LS2-GTO said:
Except for the fact that the stock system is heavy and junk.

Between the stock chambered mufflers and pinched pipes, even if minimal, there must be some gains (2hp?) to be had with a quality straight through catback system.

Besides, we all know the real gains are to be had with LT's and Mids.

Are the stock mufflers in the '05 chambered? I know the stock mufflers in the '04 just have a perforated pipe running through it from inlet to outlet.

Also, this popping people are talking about, is it a distinct popping. What I hear sometimes I would almost call a burbling sound. Anyone know what I'm talking about? Is this different from the popping? Thanks.
 

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Aw horse shizzle. No low end torque? I deleted my muffs months ago, but I also put in an x-pipe to get rid of the back fires. Believe it or not, the x-pipe knocked down the sound throughout the range a pretty good bit.

I'll share a bit of real world experience. My buddy has a stock '06 M6, and we did a side by side second gear punch from about 1500-2000 rpms. We stayed exactly door to door until about 4000rpm when I started pulling pretty hard. We did this a couple of times and the results were consistent. I didn't lose anything on the low end. Could chalk it up to more break-in or the xpipe, but he did dyno 340/340 with 800 miles on the motor, so his ride is running pretty good already. Anyways...
 
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