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  #1  
Old 07-09-2009, 11:06 PM
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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.
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Old 07-09-2009, 11:13 PM
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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.
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Old 07-09-2009, 11:15 PM
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Re: exhaust questions

I'm with dummy^^^^^^^
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Old 07-09-2009, 11:18 PM
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Re: exhaust questions

would my engine be running to rich with the combination of the exhaust and the intake?
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Old 07-09-2009, 11:20 PM
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Re: exhaust questions

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Originally Posted by Marlin View Post
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?
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Old 07-09-2009, 11:22 PM
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Re: exhaust questions

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Originally Posted by baronvonhavok View Post
would my engine be running to rich with the combination of the exhaust and the intake?
no...the pcm will adjust
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Old 07-09-2009, 11:23 PM
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Re: exhaust questions

alright awesome. thanks guys.
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Old 07-09-2009, 11:24 PM
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Re: exhaust questions

mine hasn't adjusted to the stock setup... ( it runs rich )
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Old 07-09-2009, 11:25 PM
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Re: exhaust questions

Quote:
Originally Posted by Dylans3960ccs View Post
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.
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Old 07-09-2009, 11:29 PM
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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?
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Old 07-09-2009, 11:31 PM
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Re: exhaust questions

lol, if you knew.... ahhh, never mind
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Old 07-09-2009, 11:35 PM
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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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