Siphon

iTrader: (7)

Well, I'm heading over to the local muffler shop tomorrow to fix my gutted cat problem. I was wondering about my entire piping under that car. Should I upgrade to a larger diameter or keep what I have (stock). I know cars can be touchy about exhaust diameter and backpressure.

What would everyone suggest for me? Would it help or hurt me if I go larger?

Vendetta

I have never run a true dual setup on an LT1, but I imagine a 2.5" would suit you fine for a naturally aspirated setup.

Siphon

iTrader: (7)

Thanks man. I needed a quick answer, and you delivered the goods.

Vendetta

Glad I could help, but like I said I don't have too much experience with true duals (yet) so you may want to wait on some other responses before you make a decision.

Brett95z

iTrader: (-1)

Im not sure hes referring to true duals. If your not.

Dont waste your money having your muffler shop rebuilding you a 3" system. Just buy a catback exhaust.

Vendetta

Good call, I assumed and read it through too quick.

If this is the case, just go with an aftermarket 3", preferably stainless steel.

Shon Herron

iTrader: (25)

I have had shorties/catback, shorties and muffler in the cat location dumping, LT's/duals over the axle, LT duals/bullets dumping, LTs/duals Aerochambers before the axle, I have a bunch of exhaust.

not one picked up MPH on my 355 LT4H/I HOT cam car, tuning did more for me.

SO, on this 97 I went with a quiet sound that is pleasing, I picked it up with a Loudmouth on it so I had the shop put in a Hooker Aerochamber muffler in the stock location and have one exit pipe at the rear bumper tucked up. and from the results I would say it is not hurting anything....

Siphon

iTrader: (7)

I recently read where my "gutted cat" is hurting my low end. Thats my main reason for heading over to the shop tomorrow. Would anyone happen to know if my car is going to get a little louder. . .going from gutted cat to straight pipe? I don't think it should, just less backfiring I think.

Shon Herron

iTrader: (25)

HA!! I got 2 gutted cats on my car now....dont seem to be bothering it....
and sound might be a little louder but not much if at all....

platniumta

i would have the muffler shop remove the gutted cat and just order a 3" catback

Siphon

iTrader: (7)

Well, I just got back from the shop. Chopped the cat off, and found out that it was a truck cat. Whoever had the car before, took a cat off of a truck, gutted it, and put in on my Trans-Am. My car, surprisingly, sounds a whole lot cleaner. I also notice that I rev quicker now. Taking off the gutted cat, and putting on a 3 " pipe did make my car louder.

blind527

iTrader: (8)

Man our cars have so much low end torque already, we can afford to lose 10 lbs. of it. When you put long tubes on you lose some low end torque but gain tremendous hp in the mid-high RPMs. I have a full 3" system, from the collectors back, works great