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!!!!!!
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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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