I couldn't do the 16v 1.0 K11 in my K10 previously (without the kit) although i did have an exhaust that was killing off my top end revs, lower down it was much quicker than with just the stock k10 exhaust (IMO) but obviously with my high revs being non-existant and the K11's being that much higher output at higher revs it killed me after about 3,500rpm.
The car's finally in the workshop so with the sr20 lump i should be munching on Nova's all too soon 
