Originally Posted by
rangcrx
2.5in cat with a res out to a ep3 muffler and that bitch is nice and quite I did not lose performence nor flow
I disagree.
No matter how high flow the cat is, it will cause a restriction. Add a STOCK chambered muffler and that will make it even worse.
We have done MANY exhaust test on the dyno. The more resonators/mufflers in line the more it will restrict flow. Granted you will get the lower tone/less raspyness but again, you will lose performance.
OP: Id suggest 1 or 2 vibrant/magnaflow resonators, use your Apexi muffler, 2.5" SS piping.