Dynomax Catback exhaust a total letdown

[strongboy2005]

I'll let my new times do the speaking:

18.10 @ 75.3
18.00 @ 75.3

I couldn't bear to do anymore runs...

I can feel a significant decrease in low end torque and power. Granted it does sound good, but is really just a $150 noisemaker. I was expecting around 5 hp, or maybe slightly less, but I believe I've lost nearly 20 ft-lb. of torque or more, with not much power increase in the upper RPM (certainly not enough to make up for the drop in 1/4 mile time).

I will be reverting back to stock ASAP...

Anyone had better luck with a different muffler? (Sucks to pay $150 and lose 1.5 seconds on your quarter mile, it feels like a 4-banger now)

[2000blazerls]

Well I went with a Magnaflow Highflow Cat and a Lawson Industries Incinerator muffler. I got a slight gain and much better sound. Everyone on the board seems to be in love with Ravin but I could never find one. The Magnaflow Catback system is supposed to be good but they sound like shit if you ask me. I just got the Cat because most of the high flow cats are the same. I would not get a Magnaflow muffler.

[ZL1power69]

i have the dynomax kit and im totally satisfied with it (except it is a little too quiet).
i don't own a gtech so i don't know what i gained from it. the techs at dynomax said to expect a 5-8hp@wheel increase.

[dmbrisket 51]

magnaflow cat and flowpro muffler, no complaints

[Blazer SS]

JBA ceramic headers, stainless steel high flow direct fit cat conv, JBA cat back stainless exhaust , Love it, not loud, Well not too much!

[strongboy2005]

Do any of you actually TEST your exhaust systems to see if you got a gain???

The night I installed it I could've SWORN it felt TONS MORE POWERFUL...

The next day I tested it and realized it had taken my V-6 and turned it into a 4-banger...

[tom3]

Lose a second and a half with a low restriction exhaust? That's not possible. Stick a potato in there and that might do it. I'm guessing the ECM didn't have good mixture control on the fuel/air ratio or something.

[JoulesWinfield]

Sounds like the minimum back pressure was not maintained with the "free flowing" system.

[strongboy2005]

Originally Posted by JoulesWinfield

Sounds like the minimum back pressure was not maintained with the "free flowing" system.

Basically Dynomax = crap

because they don't research for anything more than sound quality, apparently...

[JoulesWinfield]

Ouch!
Thanks for the info, at least when Im lookin for a new catback system I wont get theirs.

[TheBrettster]

yea i would go with magnaflow , edelbrock or ravin. You need to stay away from free flowing (no restriction) systems you lose all your low end torque by doing that. you need a little restriction to still get that kick that your looking for.

[JimmyGold]

I just installed mine about 4 weeks ago. I have the Dynomax Super Turbo Kit and at around 3,500 - 4,000 RPMs I feel a clear difference.

How is it possible to actually lose power with less restriction and .5 inch larger pipes?

[Rmbodie]

Are you sure it was put in with the muffler in the correct direction . I have seen one put on one backwards . They sound ok but air flow is severly hindered . Rob

[ZL1power69]

Originally Posted by JimmyGold

I just installed mine about 4 weeks ago. I have the Dynomax Super Turbo Kit and at around 3,500 - 4,000 RPMs I feel a clear difference.

How is it possible to actually lose power with less restriction and .5 inch larger pipes?

same here. the only problem i had with mine was that u had to take the right rear wheel off to get the pipe over the axle. after a few hundred miles, the muffler breaks in and it is a little louder.

[Teal95Jimmy]

Any ever use gibson systems? How are they