Fast Intentions exhaust and header comparison. Before and after UPRev tune (Dyno)

u155282 · 03-25-2010, 05:37 PM

Quote:

Originally Posted by m4a1mustang

Don't think you can do that because the collectors are right around where the hfcs would go. It'd totally mess up the design.

Couldn't you just put them further down, past the collectors, or anywhere else where they would still do their job but not interfere with other functional elements? Maybe I don't know enough about it...

Quote:

Originally Posted by semtex

They wouldn't be LTHs anymore if you did that. They'd be regular short headers.

I didn't realize the elimination of cats is what gave them their name. That makes sense though.

Quote:

Originally Posted by NYBladeZ

you'd be better off buying shorty headers and a set of hfc's though since it's not as efficient you leave some significant power on the table.

That's why I asked the question. I thought setting it up the way I suggested would be more efficient and sound better than the shorty/hfc combo while still remaining legal.

B1nks · 03-25-2010, 10:21 PM

[QUOTE=u155282;464256]Couldn't you just put them further down, past the collectors, or anywhere else where they would still do their job but not interfere with other functional elements? Maybe I don't know enough about it...

No because the distance from where the LTH meet the block to where they meet the exhaust is a certain distance. That distance is the same as stock headers + cats/HFC combo. Most if not all of the exhausts are made to fit up to the stock mounting point. If you add onto the LTH by adding HFC then you would need a custom exhaust with adjusted measurements to mate up to it.

Not sure if I explained that well enough but I gave it a shot.

F.I. Inc. · 03-25-2010, 11:02 PM

[QUOTE=B1nks;464683]

Quote:

Originally Posted by u155282

Couldn't you just put them further down, past the collectors, or anywhere else where they would still do their job but not interfere with other functional elements? Maybe I don't know enough about it...

No because the distance from where the LTH meets the block to where they meet the exhaust is a certain distance. That distance is the same as stock headers + cats/HFC combo. Most if not all of the exhausts are made to fit up to the stock mounting point. If you add onto the LTH by adding HFC then you would need a custom exhaust with adjusted measurements to mate up to it.

Not sure if I explained that well enough but I gave it a shot.

Close enough I at least get your point. Just change where the header meets the block to, where the header meets the head of the engine...

Tony

m4a1mustang · 03-26-2010, 08:23 AM

Quote:

Originally Posted by u155282

Couldn't you just put them further down, past the collectors, or anywhere else where they would still do their job but not interfere with other functional elements? Maybe I don't know enough about it...

You could. I was just assuming you'd want to retain the ability to bolt on to any CBE.

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03-25-2010, 10:21 PM	#2 (permalink)
B1nks Track Member Join Date: Apr 2009 Location: Houston,Tx Posts: 721 Drives: 2009 370Z Base 6MT Rep Power: 509	[QUOTE=u155282;464256]Couldn't you just put them further down, past the collectors, or anywhere else where they would still do their job but not interfere with other functional elements? Maybe I don't know enough about it... No because the distance from where the LTH meet the block to where they meet the exhaust is a certain distance. That distance is the same as stock headers + cats/HFC combo. Most if not all of the exhausts are made to fit up to the stock mounting point. If you add onto the LTH by adding HFC then you would need a custom exhaust with adjusted measurements to mate up to it. Not sure if I explained that well enough but I gave it a shot.