This is a discussion on Bellmouth vs. Divorced Wastegate catless within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by WRX-maniac Ok, got ya. Eric is very good, so im sure you will be pleased with the ...
A good safe bet is a Low waste gate map. They do tend to over boost when cat less. You could also get a boost controll solenoid to regulate boost. If you go that route install solenoid before tune. I like the Cobb bel mouth DP best but it is $600 unless you know somebody. I thought I would stop at DP, but the more you hear it the more you will want a cat back. Once the mod bug bites it's ON!!!!!!
2013 WRX Stage2 Cobb DP Cobb AF intake Cobb airbox DEI reflectagold Invida N1 cat back GrimSpeed heatshield PTP turbo blanket AP Tuner custom pro tune 291 WHP 320 torque. Subaru WRX genuine Face Ripping ACCELERATION!!!
Boost creep cannot be remedied by any tuning boost control solenoid. Boost creep is a mechanical problem and there are only a few ways to remedy the problem:
1. Tune for lower target boost
2. Port and polish the IWG
3. Go with a catted DP or restricter pipe that allows slightly more backpressure
4. Go EWG
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