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Thats normal to see more knock in the upper gears. At least thats how its been with the two dsm's ive played with for the last 7 years.
I tuned my car to 3rd gear and in the upper gears I would still have a little knock. I then did a good 4th gear run and added a little fuel where the knock is. It runs like a champ now. I do need to have it tuned with a WBO2.
After a maf upgrade like that you always want to fix your boost leaks. Fix them and try to add a little fuel and see if it helps get rid of some knock.
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Jay's ~ E85 - Evo16g @ 30psi
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