^meh

...you can make as much power as you want. just know it'll be restricting you from achieving your full potential

 

It all depends on your upgrade path. Keeping the stock exhaust while upgrading your car is a losing battle though. Just by putting my stock cat back on my car I notice about 1k higher spool time with more taper, along with significantly less power. Almost all the upgrades that are done to the engine either improve something about how the car breaths in air (turbo, intake) or how it releases it (exhaust, cams, etc..). When you improve one without the other, the performance gains will be minimal. If you want to go as stock as possible though, look into a drop in panel filter, mail in tune, & simple MBC. That will free up lots of power while retaining a near factory stock sound.