No chance in hell of passing emissions. Well, at least here in mass. You'll have to pull some tricks. Hollow them out if you want to then do this: Take the cross over tube and cut off the end with the "bulb", you can always reattach it with some hose. This allows exhaust gas to flow forward through the pipe. Attach some kind of hose to it and route it somewhere inconspicous. This should divert enough nasty fresh co loaded exhaust gas to make a real difference.
Furthermore, you can get a really small pulley, like an alternator pulley and drill 4 holes in the pulley so you can bolt it up to the airpump. It wont look pretty, but boy is it effective. Loud as all hell, though. Bypass the airpump dump valve for this. Needless to say, remove or divert the TAD solenoid too. You might have to disconnect the "check engine" lightbulb since most states will fail you if it's lit and it WILL be lit after you pull the cats.
By the way..... mustangs run like **** with offroad h-pipes in my humble experience. They hesitate off the line on low throttle and sound really chuggitty chuggity until you get the rpm's up. It will be much throatier, so if the cops in your town are nazis like here in belmont, they will pull you over to "check you out" and make sure you're legal
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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