That figure is whp on a factory e36 M3. Shows up in the mid range. It would be probably a little stronger on my car but the headers (various manufacturers) are very expensive on M3 for the results. It looks like the stock header is actually pretty efficient. I had the same experience as you on my Honda. I got a very nice increase with a header and exhaust upgrade for not much money. On another note, I just got the car back from Dinan for a 100K go thru. I guess there were some parts that had been slowly degrading that I'd missed....slightly loose SC connections, air and oil breather filters that had gone too long, a weak coil that had also weakened a plug. Man, what a difference. I guess today I have no complaints with the car. |