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Message: [QUOTE="Marty, post: 199052, member: 602"] I used to run the 87 wheel in the T4i housing. This turbine [I][B]is[/B][/I] more driveable then that turbo was, but the power difference is also noticeable top end. With that being said, the 87mm wheel according to Forced inductions isn't put in the T4 anymore. Has to do with it causing the casting to be too thin and cracking. I do know there are guys out there that have a turbo setup like that ie: Craig Briggs. Personally I'd like the try the wheel forced inductions says will flow more then that wheel anyway... it's supposed to be a 92/82 wheel that mimics the GT-47 wheel. IDK, but with how driveable this is, a larger turbine is definitely ok with me. I'm assuming you're asking that based on HRT's comment. IDK if you're thinking along the same lines as in the T4 housing has a cracking issue with the 87 turbine or not. But I assume you are. If you are asking me... I'm staying with what I have for now. Kind of up in the air (lol) about what to do next. The wastegate is opening in both tunes so the difference between the two tunes is pretty much negligable. Running with or without the air filter shouldn't matter as the wastegate is limiting boost/drive, correct? On my previous setup, I ran with and without a paper filter at the track. The difference was only a couple of PSI and that was on an unwastegated setup - 60-63 psi if I recall correctly. I don't recall any drive numbers so that's why I'm starting threads like this with actual data logged. At any rate it wouldn't take but two seconds to take that filter off and try what you're speaking of. Swamps tuning. The wastegate is staying as is. What's everybody think about the boost/drive ratio? 50:60 basically so 1.2:1. At 40 psi it's still 1:1. [/QUOTE]