ray need help

[ramonsalvador08]

what is beter to use a 4.5 bell or 3 in o a down pipe for a 08 wrx

[ramonsalvador08]

so what what can i do to get more power

[SeattleJeremy]

Hello, and welcome to ClubWRX!

Here is a thread that addresses your question.
Engine Performance FAQ [[[READ ME]]]

Oh, and a bell mouth exhaust is always better, both types work, but bell mouth is better.

[ramonsalvador08]

what is beter though 3 in or 4.5 bell mouth
and dous the cool air intake actually work

[DUB]

Stop posting immediately. Read everything contained herein: Unabomber's Manifesto - NASIOC Then you may resume posting.

Oh, and welcome to the club.

[SeattleJeremy]

I think the information from this post should be copied here too
2.5'' Downpipe Options

what is beter a 3" bell or 4.5" bell on a 08 wrx

Ray, I think you're confused. There is no such thing as a 3" bell.

jpjester, There is no such thing as a 4.5" exhaust system. It's only 4.5" at the turbo.

There are three types of Downpipe inputs (the part that attaches to the turbo).
1. Bellmouth (4.5")
2. Divorced (4.5" or 3" + 2")
3. Non-bellmouth (3" pipe)

Here is Invidia's explanation on JCSpeeds' website

Divorced vs. Bellmouth:
Divorced: A divorced wastegate downpipe has a plate the protrudes into the turbo to separate exhaust flow coming out of the turbo to give reduce turbulence. This is good for stock and smaller turbochargers; the protrusion does not work with some aftermarket turbos (i.e APS).
Bellmouth: This design has a wide-open bell at the turbo, which is better for larger turbochargers with more flow. It will work fine with a stock or small turbo, but it is designed for scenarios where wastegate turbulence is not an issue.

The diagram to the right is a stock WRX turbo, so you can see how the turbocharger interacts with the Bellmouth and Divorced Invidia downpipe designs.

This thread has pictures of the Non-bellmouth type.
Engine Performance FAQ [[[READ ME]]]

[2:43AM]

Stop posting immediately.

Haha, just listen up!