ok heres the question
I have full catback 2.5 exhaust and it made my car to loud so I got a stock 91 ls muffler and put it on with the stock piping from the rear section do you guys think ill lose much power or do you think itl be okay since the rest is 2.5 it doesnt seem like ive lost any power just quieter

 

Do you have 2 differnt size pipings? if you have smaller piping than the 2 1/2 then it is the same as using the smaller pipng all the way from the down pipe back. You may lose some higher end power and gain some lower end. Probly hardly even noticeable unless you start to modify the engine more.

 

thanks