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quick exaust question

lowlux

By lowlux,
in Engines & Forced Induction

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lowlux Proficient

lowlux

Posted
Posted

Just wondering if this would do any difference? Well when i put on the vg30 turbo i had to make up a new front pipe,i made it out of 3" with 1 mandrell bend where it goes underneath the car, anyways at the time i had to quickly get it on the road all i did was weld the factory cat convertor inplace instead of putting in a 3" cat,so really the exaust is stock 3" vg30 dump pipe,then 3" front pipe with 1 mandrell bend,then the 2 1/2" gutted cat,then the 3" catback exaust that came on the car from japan. Now the flanges as some of u might know is only 2 1/2" or something like that, Now my question is would this do much to stop the flow of exaust? cause i was this week sometime just gonna put a peice of 3" pipe in there and rip out the cat,only take me 30mins to do and yes i know about the legalities so yes i might go get a 3" straight flow cat if there not to expensive.

thanks

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GILTY Collaborator

GILTY

Posted
Posted

they say your exhaust is only as good as its smallest diameter pipe...

Therefore it will be disrupting flow so go for the 3" high flow cat as you stand to be fined $11,000 or something apparently. Don't risk it as the cops are getting worse and worse and you may be the unluck fella who gets busted!

raist60 Community Regular

raist60

Posted
Posted

A 3 inch cat wont give much restriction i wouldnt think. Think of it this way when you look at a fresh cat it has about 65% of its area blocked by the honey combe crap. Yet the actual housing is normally about 2.5-3 times bigger than a 3in pipe. So it should still flow OK until it gets blocked?

Thats just me theorising

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