My HF cats were rattling non stop for the past three weeks so I decided to swap them out for the new Helix non resonated test pipes. According to the butt dyno my car pulls noticably harder from 3000 to redline . The car is noticably louder from the outside (the new testpipes did not transfer more noise to the cabin ). I like the new exhaust tone (since that is subjective I'll let you decide for youeself ).

Old vids (with the High-Flow Cats)

http://www.youtube.com/watch?v=DavlSkeNtig

http://www.youtube.com/watch?v=8I86qVrrhhM

http://www.youtube.com/watch?v=KXkk55GuDnw


New Vids (with the Test Pipes)

http://www.youtube.com/watch?v=pQShmviQx4Y

http://www.youtube.com/watch?v=5RmOg7PMuAw

http://www.youtube.com/watch?v=rgwG92BiaH0

http://www.youtube.com/watch?v=OPKyYR7OY4c

 

glad you like your test pipes. I love my helix's. Your sounds a lot diff though. Is that your only exhaust mod?

 

yeah I think after the installing the helix TPs, your car sounds a lot better.

 

i honestly like the sound of the HFC better. just my opinion.

 

I really wish I had as little rasp as you inside the car. Mine is a bit too much at times

 

Oh, I also have the Invidia G200 and Strup headers.

 

Sounds pretty good dude, and still stays decent in the interior.