Just before we get back back on topic... i.e... is a crossflow head better, or at least "potentially" better than the old style head... Consider this.... If airflow is so unimportant, why do we need more valves?.... a 16v head has more valves, giving more valve area, yes?... this extra valve area gives more/better airflow (71-74cfm average for an 8v from it's single 40mm inlet, 104-110cfm from 2 x 32mm inlets for the 16v). So, what is this extra airflow giving us... hmm... extra power... 112 for the 8v, 139 for the 16v. Here's a couple more calculations... The 8v 1400 Saxo (sorry for swearing on a VW forum!) I just did made an extra 13.7cfm on the inlet, std valve, just porting, and I deliberately kept the port and throat a sensible size so as not to reduce torque. If we go by Superflows calculations of .43hp per cfm gain we come up with... 13.7 x .43 = 5.891hp. Now that is on 1 cylinder, so x 4 for our 4 cyl engine and we have 23.564 extra hp. Now I dont buy that for one minute, so I generally mutiply the 1st figure by 2, or divide the final figure by 2... same result obviously, in this case a potential gain of 11.78hp. The car in fact gained 7hp at the wheels (8hp approx extra at the flywheel)... tho we did find a further 2-3hp by removing a substantial kneckdown in the intake pipework... highlighting the potential of the head, or removing the restriction modded head or not?.. who knows, but, in this case, a pure flow gain produced a pure power gain, from 2.5k (+2.5hp) to its power peak @ 5k (+7hp) and holding on better past peak @ 6k (+9hp) So in this case, more flow is making more power, with a better spread, and no torque loss anywhere, only gains. How about our favorite the 16v... Using the same calculation, if we take the average flow difference between an 8v & 16v head (34cfm), multiply by my prefered 0.215 (1/2 of superflows 0.43) we come to a potential extra 7.31hp per cyl for the 16v's superior flow. Multiply this by 4 and we should see 29.24hp extra for a std 16v over a std 8v (GTI)... hmm... 112 + 29.24 = 141.24..... goodnite.