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Message: <blockquote data-quote="shine1stang" data-source="post: 570600" data-attributes="member: 10450">Well its been decided between my father, my tuner, and myself that its time to step up. Since last fall ive been having some problems with the mustang. Its been backfiring thru the exhaust during wot runs. This spring i finally bought a wideband and installed it.After installing the wb i took a run up the road. The reading at wot was 9.5. Way too fricken rich! We need to lean it out around 2 points or so, for a target of around 11.5-12. 12 being the absolute highest!How is he gonna do that? you are probably wondering right now.Well i still have the small 3.8# (actually make 4.5 or so) spring laying around. So i installed it along with the 15# spring (which is making 16-17 psi) For a total of a lil over 20lbs of boost. I wont really know how much it makes cuz my boost gauge only goes to 20. HAHA What was i thinking buying a boost gauge that only goes to 20!We are gonna do some testing in the morning to make sure that the combo will work well. And that its not gonna lean out too much, but i dont think that will happen.I dyno'd at 448 at 15.8 psi, making a solid 17hp per lb of boost. Using those numbers 17*4.5=76.5hp will be my gains. In theory...I plan on taking the car to the track tuesday nite and footbrake my way into the 10s. If everything is a go!</blockquote>