I know, I know. it's my money so go with what makes me happy. Problem is, they all have their pro's and con's. (I've made a short list below.) I really don't know what to stick with. I have a chance to get one of these but don't know which one would be most beneficial. I want something that would give me the most performance gains, weight lightening advantage and not break the sound barrier.
Any opinions would be appreciated.

J's 70RR
Pro's:
Lightest
Largest diameter
Most power gains to be had.
Looks freakin' sweet!

Con's:
Way loud
Way illegal

ASM 60mm
Pro's:
Silent
Pretty light
Looks great

Con's:
it's not a 70mm
weighs more than the J's

MUGEN
Pro's:
Silent
Legal

Con's
Heaviest?
Least gains to be had?

 

ASM has a 70mm single that will make gains similiar to the J's 70rr. The ASM 70mm is also supposed to be A LOT quieter then any other 70mm single out there. The mugen being a dual won't show too much gains and is probably the heaviest.

 

I went for the Mugen exhaust on my car simply because it perfects the S2000 design. The Mugen exhaust feels like it's three times lighter than OEM (it could be?), sounds grunty without bursting your eardrums and give some amount of gains.

If I would only use my car for auto x or track I propably would have gone for the ASM 60mm or T1R.

 

I would love to have the ASM 70mm but like I said. i only have the chance to get one of the three listed above.

For me I don't mind the loudness of the exhaust as much as how the loudness of the exhaust will command the attention of cops.

 

I like the look of the Mugen the best. It looks like it was meant to come on the car. It is not extremely loud. It will definitely give you some weight savings over stock "system only weighs 29lbs" stated on Evasive.
If I had to pick for myself it would either be Mugen or the TIR 70R Sparrow.

 

Thanks for the replies guys, I've made my decision