Which motor would you swap into a 99 si before the turbo??

 

Nothing. Why add extra cost when you can build and boost the stock engine which is a perfectly capable platform?

 

the car is a coupe shell

 

If you are dead set on swaping something, just switch out the block for a c1 or c5 or even b1.A little more tourque is always nice.

Edit- If the car is just a shell then why does the first choice say just leave it and turbo it?

 

cause then i would just swap in a us b16 motor, hence the fact its a shell doesn't matter that much cause no matter what im gonna throw some motor into it. But yea just wanted some opinions. Not about time spent on swap just about the cost$$$$$$$