Resonated Test Pipes Vs HFC
 

I am trying to decide between the test pipes and HFC's.. any thoughts or ideas would be helpful.. I want to get the best bang for my buck so to speak.. and I am not sure exactly what the difference is between the two..

It really depends on the sound your looking for.... Our hfc's flow almost at the same levels as a 2.5" test pipe and the benefit of a hfc is that you won't have a stinky exhaust.

I have the GTM resonated test pipes and will write of full review this Sat. after the dyno....

I'm considering these as well. I look forward to your review.

i have berk test pipes. i love them. i do throw a service engine light tho... but i just bought a code reader from pepboys and clear it everytime it pops up. sound is fantastic and it really opens up response. there is a rasp from 2500-2800...really nothing major. i like it actually. and it has a nice cackle when u downshift. it smells....but oh soo good. haha

I have removed my berk test pipes for those very reasons....that 'rasp' sounded completely retarded and sounded more like a 'rattle' and if you downshifted anywhere under 3k you would get the rattle noise during a downshift and there was nothing about it that sounded refined or even MEAN....if it sounded mean I would have been OK...But when you downshift and you hear that cackle rattle - the car sounded like **** to be frank.

With the resonated test pipes I basically get the same exhaust note, with 70-90% less rasp/cackle/rattle, whatever...

EDIT: I must say tho, I thru a CEL with the berk test pipes after about 100 miles and then after another 100 miles the CEL went off and NEVER returned. I had driven it for ~2500 miles after that! I thought that was important to share!

resonated...mmmm... did u ever do a dyno of just the test pipes? i havent and i know ppl ask. how does a resonator work? does it restrict any airflow? maybe i might switch if i do the catback, becuase that would make the rasp more pronounced

Do you need to update your sig?

I wouldnt waste money on HFC...... The reason you are replacing the stock cats is for more flow, so why not go with non-resonated Test Pipes..

I know I loved My APS 2.5" I had on My 06 Z Coupled with Megan Racing Headers and Borla TD Exhaust it sounded GREAT!


DAN

Done ;)

And the answer is no, the resonated test pipes do not impeed airflow. At least not the GTM's. They're straight pass thru like a true test pipe except it has that enlarged area to resonate the sound thru a grid inside the pipe wall.

Ok so here is another question... I am probably going to go w/ the test pipes... now.. Is it possible to attach an X pipe to the stock exhaust? if so does anyone sell one.... and how much of a difference in gain would there be between just replacing the stock y pipe with an xpipe and getting a whole new exhaust? I have heard that the vast majority of the restriction in our exhaust is between the y pipe and the cats.. not necessarily the rest of the exhaust i.e. the muffler

It is possibly and will probably sound decent/very good. If you wish to save money thats not a bad idea...but i'm also not sure the x pipe is the complete solution because besides the downpipes I think the front y-pipe is the majority of the problem. But I supposed you would have to re-do some of that to fit a xpipe anyway...go for it!!

ok.. forgive me.. i have had a few cars.. but tbh.. i just dropped whatever money i needed to off at the shop i used to order my stuff through and they would do it for me (lazy I know).. i thought if i got the test pipes they would replace the down pipes? that is why i was leaning toward test pipes and an x pipe for the time being...

Thnk about the legal issues too. NC is getting a lot tougher on emissions and testing...

<< military.. my car isn't registered in NC :D