I'm of the thinking that an ECU upgrade is the most visually subtle upgrade you can do...The only noticeable thing to the car is the power...Certainly more subtle than wheels or an exhaust.
I would go an R20 over a GTI....Certainly the 199kw of the R20 would easily counter the extra driveline loss, and with a decent tune and exhaust, the thing would be a great car to have even more fun it...
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