searched and didnt found what i was looking for so...

i have found that the compression ratio between the K20A2 and K20A3 (i think) cause the differences in hp #'s...so in theory (correct me if im wrong) could someone just raise the compression ratio of their A3 engine by putting something like a thinner headgasket....and achieve the same hp #'s as the A2??? or is there more to it???

 

K20A3 = 9.8:1
K20A2 = 11:1
K20A = 11.5:1

A head gasket will only bump you up .4 -> from a 9.8:1 to a 10.2:1

There are numerous ways to bump the compression but the two easiest ways are pistons or a head gasket.

 

The compression ratio is part of the difference, but not all of it. As said in the previous post you can raise the compression ratio with a new head gasket, or pistons and that will increase the HP, but I don't think it will make all of the difference. The A2 has a much better flowing head and that makes some of the difference too. Now if you did a head swap, and increased the compression you would be pretty close to making up the difference.

 

ohh ok then...makes sense