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baronvonhavok 07-09-2009 11:06 PM

exhaust questions
 
hey guys,
by the end of the summer i plan on installing Kolak's exhaust on my 2004 4.7 non-HO. this exhaust is supposedly highly rated on JF. for those of you unfamiliar with this exhaust, it converts all the exhaust piping from a 2.5 inch pipe to a 3 inch pipe, and replaces the muffler with a flowmaster 70. because of my year i have the pre-cats so there is no need for a new cat, but he puts a magnaflow 6 inch resonator that will sit before the muffler (i don't know exactly what the resonator does)

now my questions are, is this worth it? is there still going to be enough back pressure in my exhaust so i don't lose power? am i going to gain or lose mileage?

this would be the second mod on my car, after the K&N intake kit.

please all help is greatly appreciated.

Marlin 07-09-2009 11:13 PM

Re: exhaust questions
 
I've heard good things about it.
You certainly won't lose any power in the bottom end, and should gain a bit in the top. A 3" system for a 4.7l V8 is hardly over-exhausted.

Scottina06 07-09-2009 11:15 PM

Re: exhaust questions
 
I'm with dummy^^^^^^^

baronvonhavok 07-09-2009 11:18 PM

Re: exhaust questions
 
would my engine be running to rich with the combination of the exhaust and the intake?

Dylans3960ccs 07-09-2009 11:20 PM

Re: exhaust questions
 
Quote:

Originally Posted by Marlin (Post 31148)
I've heard good things about it.
You certainly won't lose any power in the bottom end, and should gain a bit in the top. A 3" system for a 4.7l V8 is hardly over-exhausted.

I want more top end

what can I do for the big 6?

Scottina06 07-09-2009 11:22 PM

Re: exhaust questions
 
Quote:

Originally Posted by baronvonhavok (Post 31162)
would my engine be running to rich with the combination of the exhaust and the intake?

no...the pcm will adjust

baronvonhavok 07-09-2009 11:23 PM

Re: exhaust questions
 
alright awesome. thanks guys.

Dylans3960ccs 07-09-2009 11:24 PM

Re: exhaust questions
 
mine hasn't adjusted to the stock setup... ( it runs rich )

Marlin 07-09-2009 11:25 PM

Re: exhaust questions
 
Quote:

Originally Posted by Dylans3960ccs (Post 31165)
I want more top end

what can I do for the big 6?

Unfortunately the L6 is a lugger, not a revver. It has a very long stroke, therefore it will never have good top end. It's forte is low rev torque. Sorry to burst ya bubble champ.

Sure small gains can be had by adding free low intake and exhaust, but it won't turn it into a top end screamer.

Dylans3960ccs 07-09-2009 11:29 PM

Re: exhaust questions
 
I know just a little more HP than torque would be nice in a mod.

---------- Post added at 08:29 PM ---------- Previous post was at 08:28 PM ----------

wouldn't a shorter intake do the trick?

Marlin 07-09-2009 11:31 PM

Re: exhaust questions
 
lol, if you knew.... ahhh, never mind :confused:

Dylans3960ccs 07-09-2009 11:35 PM

Re: exhaust questions
 
yes I do

shorter = top end power
longer = low end power

but you are right that this motor will probably never make a honda jelious ,but I think it's worth a shot. So what do ya say?


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