Which Mod first?

[DE05 LSF]

I've had my new car for just over a couple of weeks, UK spec X5 3.0i Sport.

I think it's fantastic, with only 2 real complaints

1. It's a bit slow and I need to overtake!

2. The exhausts look ok, but every time I see 4.8 tips I get a bit excited

The solution:-

1. ECU upgrade, taking power to 300 bhp & torque 244 lb/ft

2. Custom made stainless steel exhausts with polished 3 x 6 inch oval pipes.

My problem is I can't afford to do both at the same time, actually I probably could but my wife would either hang me by my balls or no sex for 6 months !

So please help me out people, what would you do first?