what size high-flow CAT - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 04-09-2008, 09:42 PM Thread Starter
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Question what size high-flow CAT

i'll be installing my cartech outlaw kit with a PT76 on a 351w in few weeks and am going to have a downpipe back fabbed up since i pieced the kit together. this is a street car and i know that turbos are obviously lot more quiet than blower cars HOWEVER i want to make this car SUPER quiet and am thinking of installing a high flow cat. the question i have...

where is the best place to install the high-flow cat so that it makes this thing super quiet yet does not create any issues with back pressure?

also, the downpipe is 3" but i was thinking of possibly stepping it up afterwards to a 3.5" and running a 3.5" cat so as to offset any flow problems with the bigger sized exhaust and cat... what do you think?

any feedback/suggestions will be appreciated

thanks
paul


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post #2 of 5 Old 04-09-2008, 10:08 PM
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Def, put a 3.5" downpipe on a 351W with T-76. ..... 4" wouldn't hurt.

Put Cat fairly close to turbo. They have to get hot to work right.


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post #3 of 5 Old 04-10-2008, 12:53 AM
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random technology makes a bad ass high flow cat, kinda pricey

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post #4 of 5 Old 07-13-2008, 08:12 PM Thread Starter
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UPDATE...

spoke to random technologies and essentially cats should not be used to quiet things down, especially in turbo applications. a resonator placed before the mufflers can make a very noticeable difference.
pk

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post #5 of 5 Old 07-13-2008, 11:08 PM
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You probably do not even need a resonator depending on the muffler(s) that you pick. Our old twin turbo car was quieter than a stone stock Mustang. It had two 3" downpipes that eventually stepped down to 2.5" and went into an old Flowmaster 3-chamber cat back. It was the ultimately sleeper considering at that time it made around 1000rwhp and all it looked and sounded like was a stone stock Mustang with 95 GT wheels on it. Of course chambered mufflers hurt performance so would not be a good thing to copy, but just given a real world example.

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