The 90MM BBK would have random hiccups only at steady cruising speeds. Great off the line but annoying hiccups. The 85MM BBK didn't cause hiccups at steady cruising speeds. But my rear bumper was always covered in black soot from being to rich. Was running TTM 550 injectors with the 90MM and 85MM. With lots of professional tuning (Not By Me),the numbers were slowly coming around. I added some baffeling to the custom made supercharger snout and lost power over the shops origional design. Had the engine changed back to 74MM throttlebody with factory supercharger snout. TTM550 injectors pulled out and replaced with 440 injectors. This may prove to be a successful new mod later on,but at this time,It needs more testing. Sold the now great running engine and transmission. Our best vendors on this forum along with others are now starting with a bare block SL55 mod build,3 liter Weistec blower with V-12 BiTurbo mod transmission build to drop down into my SRT-6. I still feel bad about stopping the progress that was slowly coming around with the 90MM and 85MM mod testing,but decided it was time to go with a CP-Carrillo 55 build. Squirrel Crusher