I would never use a press bent exhaust on a turbo'd car... You want the best flow possible after turbo. Turbo will make the backpressure to the engine... backpressure after that will hinder turbo spool and performance.

If you want cheaper and mandrel just but the mandrel sections you'd need and have them welded in place with the 2.5 piping. May cost a bit more but then things would flow considerably better than a press would.

 

Bare minimum go with compression bends, they are the next best thing to a mandral bend.

 

This is just most cost effective now when compared against my goals. I'm not going for huge power, just whatever i can get, and in time i will be upgrading to 2.25 mandrel bent Magnaflow once the car is running perfect, boosting strong and all the kinks are worked out. So this is more just a temporary exhaust system to up the flow with the install of the turbo kit because just keeping a stock system will def not cut it. I'm taking this whole thing real slow. I dont plan to have the turbo completely installed until mid June if things go as planned, and i'll be taking it easy for the first month, tuning, fixing, tightening, and working out the kinks as i go because in the end i want this to remain reliable and completely daily driveable. So in short, 2.5 press for now just to open up the exhaust enough to accomodate the turbo, then after the turbo install has proven itself, magnaflow 2.25 mandrel bent at the end of the summer or if some unexpected 440 falls into my lap

 

Hell, Honduh guys throw swap stock exhausts all the time, RSX for civic, type R for non type R. It may not yield the highest gains, but anything is an improvement over stock.