Simon here in WA has tuned an NA BA XT. This car has a full exhaust, intake and a custom tune and it pulled 179rwkw from memory. But before the tune it pulled something like 169rwkw from memory, the thread is over on ff.com. The 169rwkw sounds high for an NA with just exhaust as a stock NA pull about 135-140rwkw, mine did 137rwkw. Don't quote me on the figures above as I could be wrong! Also I am 90% sure that I have seen the above car at the Motorplex on a number of nights and the best that I have seen it run was 14.9X. The car looks very very slow of the line and then seems to make a bit of ground from mid track. The auto and tall diff don’t half. I think the XR6 with a shorter diff would be much better. Might be worth sending Simon a PM and asking him for more details as there is not a lot of detail about NA tuning on forums. I would like to see a dyno graph of a tuned NA with rwkw and torque to compare to my graph. I don’t think that the results have been as good as anticipated at first, nothing like the Turbo anyway!