im not sure if mine is because the stock setup was modified, it looks like a two hoses were spliced together to be honest i couldnt explain it without a picture reference but, i recently put in a cold air intake so the box is gone altogether, i didnt see a black box as was described, is that all i need to upgrade? the other thing is is there anything really wrong with keeping speed density when upgrading engine parts?
Black 87 GT 5.0
built internals pistons rods and what not,cold air intake,rebuilt aod w/ b&m shift kit,electric fan upgrade,shorty headers,2 1/2 inch exhaust to dummy muffs :P hollowed cats 3 inch outputs
Painted the middle console and dashboard to black/metallic blue, all vinyl parts were sprayed black sanded and layered heavily with the blue paint creates a pearlescent effect door panels and interior body panels soon to follow. seats are being done in dark blue vinyl.