Just received the new Ark Type 2 Grip True Dual exhaust

Zeto

Ok guys under much research and testing it is from the test pipes and possibly HFC. I bought 2 sets of test pipes, the FI resonated ones and Berk test pipes. They both created the hissing sound. The FI resonated ones a little less but it was still evident. I went back to stock cats and the beautiful exhaust sound was worth the sacrifice in power. With that being said I'm selling 2 sets of test pipes, any interest? lol

Daishi

The problem is the X pipe..

DannyGT

No it is not...if anyone on this forum has experience with this, it is I.

I have many posts regarding this and all the different setups I went thru to somewhat resolve it.

The resonance (sound) definitly pops right before/at the X-H-Y pipes, but it is 100% started and caused because of frequency that begins with the addition of the test/HFC.

The closest thing to removing this sound is either adding resonators right before that joint (a la Invidia CBE, which still doesnt kill it completely, but greatly reduces it) or going back to stock cats.

I am going back to stock cats, the loss in power is worth having a cleaner sound + the upkeep in stains building up against the rear bumper. But then again, I'll be happy I'm putting them back on because that means my supercharger has arrived

__________________
Performance GTM Stage 1 SC, GTM Res.Test Pipes, Invidia Gemini Exhaust, GTM HD Oil Cooler
Wheels & Suspension AME Tracer TM02's 19x9.5F 19x10.5R w/ 265x35F & 305x30R, Hotchkis Sways, BC (BR) Racing Coilovers (Car Sold)

Zeto

Daishi, it's not the X-pipe. Before I got my Ark exhaust I had the Berk TPs alone with a stock exhuast and STILL had the hissing sound. Like DannyGT said, its the resonance.

Daishi

according to m4a1 if you have an exhaust without a crossover you dont get the hissing.. Its hard to pinpoint the sound exactly. On my car it sounds like it comes directly from the xpipe.

Zeto

Yes the sound does come from the X-pipe but the CAUSE of the sound is the testpipes and HFCs.

Daishi

Ok but if you can get an exhaust system that either has an xpipe design that doesnt cause any issues or something without an x pipe you can be happy while producing more gains.