Had this unit installed today. Full cat-back. I recoated all piping flat back, because this was bought used. This system has 2 resonators and good thing. This exhaust is very quite. Not loud at all and has a nice deep low tone, no raspyness what so ever. So glad to hear my car rather than my exhaust farting. Not bad for 200.00. The system it replaced was a Apexi n1 NA muffler and custom welded crush bent piping, no resonators. Apexi n1
HKS Hiper

 

I dont think i know anyone personally who has the Hiper. I figured it would be louder than that, oh well, props on the good deal and good luck selling the N1, im sure you wont need it though.

 

The N1 is garbage. The welds rusted on the back of the canaster and eventually the rear came off. You could see and touch the packing inside. Apexi n1 has this problem. They suck and are too loud. HKS is AMAZING!!!!!! and grould clearance is way better with this then the N1 but have the sam style. The only down is when u buy these new they are like 600-700.00 where the N1 is only like 400.00