Muffler Q

just recently i bought a hot shot header and flexpipe and got all new exhaust put on, and my muffler is an obx type r muffler... when i gun it i get alot of crackling through the muffler and i was just wondering if if a diffrent more racing style muffler would work better and sound better....

92 celica gt

Hot shot header & flex pipe
New 2.5" exhaust
short ram intake
obx type r muffler

I ran bigger exhaust and it still crackles....just incase somebody doesnt say bigger exhaust. thanks