It could be. Do yo have the stock distributor. I have always been a little afraid of aftermarket "performance" distributors (even MSD) as they are hit or miss. If you do not have the stock one try getting a remanufactured one from Autozone.
I cannot see (in the pic you posted) the oil feed and return lines for the turbo, do you have them? You will need a fitting that will go on the oil pan for the oil return as well. Also what about injectors, what size are you using? Is your MAF calibrated for the injectors?
Hey man, glad to see another turbocharged mustang, especially here in the bx. I would love to drop by some time during the weekend to see how it goes (if you dont mind, of course) Anyways, post pics!!! lots of them, LOL!
or you can try this guy on Ebay. He is one the best kept secrets in the car world, LOL!!! he sells those bends so cheap it's unbelievable!
tootperformance | eBay
if he doesn't have the size you want just email him and he will start a new auction for you with the size you like
the thing is that every setup is different. Even ponydown performance had like 2 or 3 different setups so unless you know which "stage" headers you have you will be better off building your own downpipe. That being said I have a few 3" bends and some 4" bends. I can give you some of the 3" or...