I have an 02 Z28 with the stock catback and muffler.

I have heard that the increased horsepower from an SS vs Z28 is mainly due to the restrictive exhaust. I found a SLP SS muffler very cheap and will be replacing my Z28 stock muffler with the SLP muffler. Will I be waisting my money or gaining HorsePower?

 

Well it depend's how much they want for the exhaust. Spend the money on a cutout instead. A cutout will be worth your money.

 

I have a Z28 as well and kept my stock exhaust and muffler but just added a cut out to bypass it so it's restrictiveness is of little concern to me, unless the cut out is capped of course LOL.

 

I bought the muffler for $40 plus shipping, it came off an 02 SS. I had a 98 SS a while back and it had the SLP exhaust with the single tip. I liked the sound, so I will give this one a try and see what happens. I was wondering what is the difference between the SS muffler and the Z28 muffler internals.

I dont want to go with a cutout right now as this is a daily driver. I want to keep the sound down to a mininum but still get some better performance.

Thanks for the reply!