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Old 08-27-2003, 10:02 AM   #34
500hpwrxsti
Scooby Specialist
Member Sales Rating: (1)
 
Member#: 22459
Join Date: Aug 2002
Location: VA. Beach, Va.
Vehicle:
2002 WRX GT40R
700AWHP but whos counting

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The purpose of the tumbler valve is like a choke on other vehicles, it aids in fuel air delivery during cold startups. By doing a delete, you increase the air flow through the intake manifold which increases HP.

I did a tumbler delete myself on my REX. The process wasnt hard to do. I cant tell you what the HP gain was officially, but a gain was noticed.

The APS unit is a super nice unit and with the extra injectors you can acomplish alot of different possibilites. Just remember, you have to have an aftermarket ECU to do either mod, yourself or APS.
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