Fast Intentions Long Tube Headers are here!

XwChriswX

It will prolly be just as if you didn't even have it installed, since you're just relocating the same restriction. I really hope you don't spend the money for headers just to negate their purpose with a Cat in your exhaust.

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

SS_Firehawk

That doesn't make sense to me. You are still improving exhaust flow regardless. I can almost guarantee that a LTH with HFC will outflow testpipes and HFC because it is leaving the headers more efficiently. Granted the difference may be academic, but they will always come out on top.

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XwChriswX

Ok, so you're looking at spending $1500~ for 3-5 extra hp over a HFC setup?

If you're talking about doing that, save yourself some $$$ and get the Stillen headers and HFC's...

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

babbagandu

Do you really think a single high flow cat would completely negate the gain from the LTH? Maybe I am wrong but it looks like the LTH increase power substantially throughout the whole power range. How much would the cat on the XYZ pipe restrict air flow that it would cancel out the LTH completely?

XwChriswX

The same reason there are 2 cats on the Z already... You're asking all of that exhaust to go through 1 cat. Unless you're talking a 3" pipe back... You're going to have a lot of restriction at the cat entry point. And that backfill will prevent flow... and thus, neutralize power. That's great that you get it out of the engine efficiently, but it's just like on the highway asking all of that to go to 1 cat. Back up is inevitable.

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14

SS_Firehawk

It is a 3 inch pipe connected to a 3 inch cat. The hp loss from that cat in comparison to no cat would be minimal. Maybe a 3-5 hp loss at it's worst. I already ordered LTH's, I'll be getting the motordyne Y pipe w/ cat next month, and the CBE afterwards. It's a bit backwards :P but I got a killer deal on brand new LTH's and the y pipe is more than half the price as the CBE's. It probably won't be installed until Feb unfortunately because I'll still be out of the country till then. It will be like christmas... funded by me and for me.

And please don't take anything to heart because we both know our answers are hypothetical until proven. I also completely agree that LTH's are not worth it for most people and "similar" gains can be achieved going a different route. IMHO, nothing beats the sound of a nice car that has a full exhaust setup with long tube headers. That scavenging sound, the crackles, and burbles to my ears are priceless.

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XwChriswX

Just a hint of rasp to let you know it's not stock. But not a fart can honda sounding.

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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14