Camry headers? Options

[mi645]

I recently found out that some camrys came with a 4-1 header oem that deletes our first cat? Is this a bolt on to our a car? 99 Celica California spec I'm trying to get rid of the pre cat would it would bolt on 100%?

[Special_Edy]

When you put a header onto a stock 5sfe or 7afe all you are doing is unrestricting the most unrestricted part of the engine. The intake ports and the way they flow into the combustion chamber is the bottleneck. Its a sharp bend from the intake down into the cylinder, fluid dynamics tells us that bends are really restrictive and that the less angles a pipe(or intake port) has the better it will flow.

Edit* Let me put it this way, removing the precat and putting headers on sounds like a great idea. You can eliminate all that nasty backpressure. But in reality your engine doesnt have a lot of backpressure, or any trouble breathing out the exhaust, because its being suffocated by the cylinder head so there really isnt enough air to expell.

This post has been edited by Special_Edy: Jan 25, 2013 - 10:34 AM