Does the 5M use the same HG as the 7M? If the 5M uses the same HG as the 7M you'll see a significant bump in CR from billing and then installing a HG that's thinner than stock... could be a good thing could be a bad thing... depends on the health of the engine and your future plans for it. Just keep it in mind.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.
If you're so inclined I'm always more than happy to accept tips via PayPal. 
Tip Jar ---> 
|