I like the way dual exhaust looks on your car and until about a day ago I thought it improves performance too. Someone told me that you shouldn't put dual exhaust on a 4 cylinder car b/c it actully slows it down. They told me it slows your 0-60 down by a whole second, is that true? I have a rex w/ a b18 dropped into it and I wanted to know if putting 2 seperate exhausts (not a dual tip) will actually slow me down.. please respond ASAP. Thanks guys..

 

loss in velocity in exhaust piping, the point of a exhaust system should be to reduce back pressure will maintaining velocity.

 

LegallyBrown786 is right - it will not help you. there just isnt the same amount of exhaust present as there is for a 6/8 cly with larger displacement. if there isnt enough velocity, the exhaust will not flow as smooth. there is no reason for a dual exhaust in your situation

 

no exhaust velocity is a direct relation of piping diameter. you can have an effective dual exhaust if you use smaller diameter piping. if you have 2.5" for single exhaust for all header runners you would need aprox 1.25" diameter piping for each grouping of 2.

exhaust flow is created by a vacume effect. ive explained this in mroe detail in numerouse posts. do a search.

if you have proper diameter piping you will have no reduced performance.
backpressure is bad, exhaust flow is good.

too big of piping = not enough flow (balanced pressures)
i hate these backpressure homos who think backpressure is neccisary. it is NOT. its all physics

 

Heh, heh

Not to mention the added weight!

 

thats why you put dual 1" tubing

 

i would assume that the cross area of the exhaust pipe would determine the exhaust velocity, wouldn't the dual exhaust diamete need to be 1.58"?

 

Usually when a car has dual exhaust, it has 2 headers. There's a rule of thumb, 1 exhaust pipe per header.

 

exactley my point, maintain velocity while eliminating back pressure, sole purpose of an exhaust system.

 

4:15 PM 5/26/2002

3 months old we are