I have an HKS Hi-power dual, it doesn't get much louder with a test pipe but there's a change in the tone. Difficult to describe, it sounds the same volume but more clicky/raspy throughout the revs and there's a mid-high pitch ringing drone while cruising around 3.5k rpm. The Berk cat I have gets rid of the ringing but the butt dyno says keep the test pipe on.

 

I totally agree with mikeyds, about it doesn't get much louder, it has a change in tone, it is raspy, and my dyno also recommends my RSG test pipe.
I also have a 2002 as mikeyds.
Mine has an "ASM I.S. design titanium dual exhaust". Mine is Vortech supercharged at a measly 6psi.
My problem is... my resonator blews out with the test pipe. Wondering weather to replace again or delete?

 

You have this exhaust and the resonator broke? Go Tuning Unlimited I know the muffler has no packing material, resonator is probably the same. I would suggest you contact Go Tuning and see what your options are, they might be able to get you the front section of the exhaust. The exhaust is designed for NA use.

I have a Toda Racing 60mm resonated test pipe for sale.

 

May I have a price for your resonator pipe? Also, I will be getting intouch with Go Tuning. Thank you very much, Jack.