The barrier is mainly down to cost when you're working with 4 cylinder engines - a few quid more in kit new isn't easy to get back on the sale price of a new car so they tend to look for savings more rigourously.
The 6 and 8 cylinder lumps can be made to run cleaner as they're less stressed and people expect to take a hit on fuel economy aka CO2
__________________
===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
|