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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

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Old 06-03-2009, 01:10 AM   #1 (permalink)
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Default 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..
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Old 06-03-2009, 01:53 PM   #2 (permalink)
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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.
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Old 06-03-2009, 02:13 PM   #3 (permalink)
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I have the GTM resonated test pipes and will write of full review this Sat. after the dyno....
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Old 06-03-2009, 02:18 PM   #4 (permalink)
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Quote:
Originally Posted by DannyGT View Post
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.
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Old 06-03-2009, 02:33 PM   #5 (permalink)
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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
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Old 06-03-2009, 02:40 PM   #6 (permalink)
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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!
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Old 06-03-2009, 03:28 PM   #7 (permalink)
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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
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Old 06-03-2009, 03:58 PM   #8 (permalink)
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Quote:
Originally Posted by DannyGT View Post
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!
Do you need to update your sig?
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Old 06-03-2009, 04:43 PM   #9 (permalink)
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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!


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Old 06-03-2009, 05:44 PM   #10 (permalink)
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Quote:
Originally Posted by ZforMe View Post
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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.
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Old 06-03-2009, 07:54 PM   #11 (permalink)
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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
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Old 06-03-2009, 11:19 PM   #12 (permalink)
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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!!
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Old 06-03-2009, 11:51 PM   #13 (permalink)
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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...
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Old 06-04-2009, 02:46 PM   #14 (permalink)
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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...
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Old 06-04-2009, 02:52 PM   #15 (permalink)
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<< military.. my car isn't registered in NC
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