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How good is the custom intake on this site...and y is one better then the other, and how much better???? How much extra horsepower would it give me if i had my exaust done too, i have a 1990 z24 3.1L
 

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Kyle, if a custom intake is made right and the exhaust is done too, you will yield 5-10 HP. Add a set of headers and a high flow cat and you add another 5-10 HP. If you can get the car to draw in cold outside air(away from the inside of the engine compartment) instead of under hood air, then your throttle response will improve even more. Remember that speed equals money.
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Yes, the intake on this site is good

As for headers, there isnt really anyone that makes them for our cars. I saw some once for a 3.1 in a Beretta that a guy was custom making. They were selling for $600 US. I don't think they would work on a cav though because of clearance issues. I got my high flow cat for about $130 US installed.
 
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