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yea im going to get new spark plugs this week and see how those work out Im pretty sure that will fix my problem

No I have a upgraded wastgate set at 21psi

yea I have it setup for that it just started doing it within the last 5,000 I think its the spark-plugs im kicking black smoke when Im getting high rpm at full boost

I also have exhaust but no downpipe

I have a mazdaSpeed 3 with about 75,000 and I have cobb intake hks blowoff and I have my car boosted to about 21psi and I have rear engine mount I was wondering what else cheap is worth getting for it. and I need help I have never had a Tune-Up and does anyone know a recomended milage for that...