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  #1  
Old 06-30-2013, 02:05 PM
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Cat Back and Cold Air Intake

I'm thinking of adding a Flowmaster American Thunder Cat Back and a K&N FIPK. Should I go with both or one? Would a drop in K&N be better? Live in Northeast. Thanks!
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Old 06-30-2013, 02:11 PM
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Re: Cat Back and Cold Air Intake

go with a drop in, a ported throttle body (80MM) and yes the cat-back
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Old 06-30-2013, 07:13 PM
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Re: Cat Back and Cold Air Intake

Should I go 80 or 85? Also, would I have to Tune it after adding that? Should I add a Catch Can too and if so would the stock air filter housing interfere? Curious as to why you would opt for the drop in. Thanks!
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Old 06-30-2013, 08:31 PM
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Re: Cat Back and Cold Air Intake

based on others experiences on the hemi, the stock airbox give better low end over a cai. the 5.7 likes the 80mm over the 85mm. I would go 85 if you have major mods internally, or running boost. 80mm for a mostly stock motor with bolt ons and tune
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Old 06-30-2013, 08:32 PM
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Re: Cat Back and Cold Air Intake

not sure on a catch can
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Old 07-02-2013, 04:59 PM
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Re: Cat Back and Cold Air Intake

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Originally Posted by Strongjeff View Post
the 5.7 likes the 80mm over the 85mm. I would go 85 if you have major mods internally, or running boost. 80mm for a mostly stock motor with bolt ons and tune

Not the case if you go with a taper ported 85mm, as you get the best of both worlds. Unlike a straight bore 85, no tuning is needed for A/F, and I immediatley noticed better throttle response at all RPM. The modern Muscle 85 TB was the second mod I put on after catch can.

Catch Can is the first thing to get. Not only keeps the throttle body and intake from getting caked, the Hemi runs better. WIth the stock setup, when those unburnt hydrocarbons are fed back in to the intake through the PCV, the effective octane number is reduced, and the ECU pulls timing.
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Old 07-02-2013, 05:11 PM
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Re: Cat Back and Cold Air Intake

Thanks. Can the Catch Can be added with the stock air filter housing?
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Old 07-02-2013, 05:22 PM
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Re: Cat Back and Cold Air Intake

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Originally Posted by dmsfun View Post
Not the case if you go with a taper ported 85mm, as you get the best of both worlds. Unlike a straight bore 85, no tuning is needed for A/F, and I immediatley noticed better throttle response at all RPM. The modern Muscle 85 TB was the second mod I put on after catch can.

Catch Can is the first thing to get. Not only keeps the throttle body and intake from getting caked, the Hemi runs better. WIth the stock setup, when those unburnt hydrocarbons are fed back in to the intake through the PCV, the effective octane number is reduced, and the ECU pulls timing.
I had forgotten a tapered bore
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