I would like to fit a nice shiny stainless exhaust system to my new Supercharged engine but the only ones available are 1 7/8" ID.
Fletcher or PlayMini
Do I need a 2" exhaust system or will 1 7/8" be suitable?
Any ideas please?

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

1 7/8" will probably perform better than the 2".
If the exhaust is too free flowing on a supercharged engine then a noticable amount of the charge can actually escape (dependant on the overlap of your cam of course).

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Too many cars, and too little time.

Forgot to add, this will mean reduced low & mid range torque, and possibly reduced peak power too. This is different to turbocharging, where free flowing is best.

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Too many cars, and too little time.

aren't you going to run it on GR's dyno? if so, you'll test with different exhausts to find the best one.

Pick your bling after GR has worked out the correct size for it

I dont think you guys realize just how lucky you are to have someone like GR and an Engine Dyno so close to you...... Its all seat of your pants up this way!

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http://www.youtube.com/user/Hanras

I know how lucky they are...

Yes I think so.
Sounds like a good plan, better get stuck into the engine rebuild then and stop stuffing around with the body.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

depends how much HP you will be making and you're cam.

if you dyno it let us know how you get on

mine has 2"

mine is also 2' but i have not set mine up yet.

i actually got mine ceramic coated looks really nice.

hard wearing as well & runs a bit cooler in the engine bay.