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I've had a set of "Mach IV's" from Don M for a lil while. So these will NOT smoke less then extrude hone injectors due to the size. However since the day they went in it has been extremely cold and snowing every other day (or slick out) so I haven't been able to play higher levels as much as I would like. These are my daily drivers, and I can now make smoke on injectors only...granted not alot but still visable. With my camshaft, 4.10 gear, and small turbo housing it was very hard for me to get the DDIII's or BD IV's to smoke box off. So I know they are adding the fuel. Idle sound has changed slightly. EGT's box off won't go over 1100° and around 38 to 39psi. Level II on COMP=1200° Level IV on COMP=1350° Level V approaches 1600°, but with my small exhaust housing I expect it to be up there. I haven't been able to get boost peaks lately because by then I am doing 90+ and the road conditions hhaven't been favorable.
All I can say is I am very happy with how they turned out. However people in colder climates, if you go this big for dailys you might not like them due to the fact you'll have to use light throttle around town or you spin. So far the coldest I have started with them has breen around 5°.
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