Power to weight is still power to weight, and an N/A 2.5L world challenge car (say one of the Bimmerworld E46 cars that are for sale) has to weigh 2750(or more) vs 2100 for a 1.8T VW with the 33mm restrictor (2200 - 50 for FWD and -50 for struts) The stock K03 inlet is 34 mm and we can get 22psi out of it. 1 mm reduction should only take you to 18-20 psi boost and we make 225 whp at 15psi in my buddy's 1.8T powered corrado street car on 87 octane. With a 3.38 r&p it's still pulling hard at 130mph in 5th gear (.80) so yeah I think a 1.8T 'rado would be tough to beat in STU. In STL the clear overdog is a B18C1 CRX especially with a standalone ecu to optimize VTEC and fuel/spark.