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Good thread here
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:)
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TeamARK. The hiss is not from the flanges where the cats meet. Even with the Fast Intentions long tube headers the car makes the same noise.. the way the engine is designed it just makes this noise. The less restriction you have in your exhaust system the louder it will be.
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After going through 2 sets of test pipes, I don't think there is any solution to this. I could be wrong but I think I'm the only one with an Ark exhaust AND test pipes. Unless someone else can chime in. |
We had sofa_kings car with and without the HFC. I guess our definition of "hiss" is different. But its a fact that there is a difference in sound between the two.
More hiss with the HFC. Alex |
Hisss
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Personaly I hate the hiss.. I'm 99% sure it comes from the xpipe. I've sat under the car while someone revved it and most of the rasp/hiss comes directly from the xpipe you can clearly hear it.. I'd like to switch exhausts and test thigs out but that becomes expensive and I have no guarantees that it will be any different.
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I haven't noticed any 'hiss'
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The hiss DOES come from the X-pipe. Even my FI 18" CBE with STOCK cats has a little hiss. HFCs or test pipes only amplify the effect because they allow for higher airflow into the X pipe. The only exhausts that DON'T hiss are ones without a crossover pipe. Toohip and ZCarMan both run the AAM Competition CBE (version 1) with HFCs and there is ZERO hiss. |
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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 :D
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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 ;) |
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the louder the hiss the more power your making!!! HISS FTW!!! :)
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Some people thought I was boosted because of the hiss lmao!
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My Ark with berk HFCs hisses also. It does it on wot and decel. Not horrible, but I definitely hear it. Don't really care cause the butt dyno approves!
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This is what I told Daishi as well. The Hiss/Rasp cannot be eliminated but can be reduced with the help of our X-pipe.
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Oh yea, I knew that going into it and it's actually much better than I expected. With HFC's and/or test pipes the hiss is pretty much unavoidable. I will say that it is really not bad with HFC's. I can't speak for test pipes, but I would assume it would be noticeably louder.
In any case, the exhaust sounds awesome. I'm completely satisfied with my purchase. My installer really liked the system as well. |
any videos with the HFC?
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Are there any vids yet?
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I sold the car but let me see if I can get some.
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Sold the car?? Man dont go nuts looking for vids, I was just looking to compare it against mine.. The ARK $1200 VS my $860 set up.. I just did a review of another option for exhuast for everyone.. Now worrires man.
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I was also asked if the car was boosted due to the hiss. It does sound great anyway. The hiss is only with test pipes really. And it sounds great from the rear of the car as stated above. It's a good piece.
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+1 For more videos!!
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Nice review!
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