Can't really help you on your question about single or twins. I don't have either one bolted on just yet, but should have one on in a few weeks/months pending on what I decide to do on my motor.
If you go with a turbo, you will need to either buy a lower intake of some sort, upper intake and a few other misc. items. If your interested in swapping your parts for parts off a stock mach 1, let me know. I got one here that wants an eaton swap done to it and we can exchange parts or you can sell off all your supercharger parts and buy them from the market here and come out with some cash in your pocket.
On your IRS, you can trade almost anybody for their SRA and there should not be any problems. Pending on who you trade with, you might lose the cobra brakes. Mach 1 and bullitts share the same brakes, but the GT's use the smaller ones.
I swapped my SRA for a IRS in my mach and have not had any issues that your worried about. It's a straight across swap except for needing to buy a new u-joint. Keep in mind, you will lose whatever catback you have on now.
If you go with a turbo, you will need to either buy a lower intake of some sort, upper intake and a few other misc. items. If your interested in swapping your parts for parts off a stock mach 1, let me know. I got one here that wants an eaton swap done to it and we can exchange parts or you can sell off all your supercharger parts and buy them from the market here and come out with some cash in your pocket.
On your IRS, you can trade almost anybody for their SRA and there should not be any problems. Pending on who you trade with, you might lose the cobra brakes. Mach 1 and bullitts share the same brakes, but the GT's use the smaller ones.
I swapped my SRA for a IRS in my mach and have not had any issues that your worried about. It's a straight across swap except for needing to buy a new u-joint. Keep in mind, you will lose whatever catback you have on now.