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You can spend about $5k on headers, cats, mufflers, and air filter and not get much in return, maybe 20rwhp. So don't expect much other than sound, but still fun to do and worthwhile if you have the money.
I would recommend Cargraphic exhaust components as they are TUV approved and they offer warranties on their cats unlike some other manufacturers. I have no love for Fabspeed. The air filter may be more trouble than it's worth based on some peoples experiences with aftermarket filters and MAF failures, but K&N and BMC are the largest name brands.
Don't bother paying extra for the Gemballa or Techart name, stick with Eibach or H&R springs. They produce the springs for the other companies anyway. Yes you would want to replace shocks as well. BUT at that point you may as well get the Bilstein Pss9 kit.
Get a lightweight flywheel next time you replace the clutch for the best acceleration performance mod.
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