crazyjoe

Just as a thought to tone down the "blattiness/rasp" of the GMMG after LT and offroad y install. Would it be possible to place a single hi-flow cat in the y-pipe after it joins together? Is there even enough pipe? How long is a magnaflow hi-flow cat anyhow? I have the pacesetter y if it helps. I was thinking cat instead of a bullet muffler because it's shorter and I dont want to hack up my GMMG and put a bullet muffler in the I pipe, and I'm obviously trying to do it as cheaply as possible since only going with one (looking back I should've just went with a catted y in the first place, oh well, lesson learned). So, any thoughts?

Joe.

manueltarin

iTrader: (6)

I have pacesetter with ORy, then 3'' cutout, then a single highflow cat to reduce noise for daily driving. It really cut the raspiness out and sounds really good. I originally bought two thunderbolt 3'' high flow cats but only used one. LEt me know if you want the other one.

Thebeast431

iTrader: (2)

I heard that that will strangle you exhaust quite a bit and you will loose lots of power. This is how I fixed my problem. I also heard you can buy another intermediate pipe from GMMG for around 100 bucks.
I have LT's, ORY and GMMG and I put a powerpack muffler in my Intermediate pipe today, with the exhaust flow going against the louvers. It took 100 percent of the rasp away. My bad spot was 2k to 3k rpm's. Now this is my best spot. I bought these Medium Powerpack had them installed for 20 bucks. Best investment so far.

Travis

manueltarin

iTrader: (6)

That's true. If you are going for all out power don't put a cat unless it has a cutout before it.

RevGTO

iTrader: (12)

Do you mean to say you put it in backwards?

Thebeast431

iTrader: (2)

The power pack can go either way. Going against the louvers you create more back pressure, thus eliminating the rasp, at least it did in my application.

crazyjoe

Well I definitely dont want any power loss. I'll look into the powerpack, sounds like you had exactly what I have, 2K-3K the rasp is horrible. If it cured yours it's probably exactly what I'm looking for. Thanks for the info fellas.

Joe.