i already have constant oil changes, fuel injection cleanouts, tune ups, and have a dual flowmaster american thunder series muffler
i heard you get better gas mileage and like a whistle noise when shifting *mine is an automatic though*
...a y pipe so i'd have 2? i used to have a glasspack and it sounded a little better but not as loud...the guy said he could put it back in and y pipe it so it'd be dual glasspacks for $150, or do the same with the straight pipe...whats better?
i have a single glasspack now, and they were going to cut it out and put a pipe in to make it a straight pipe since the glasspack is the muffler...so i mean i jus want it to be as loud as possible but sound good?
i have a single glasspack now and its not really loud enough