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Exhaust mod in N55 E92 after DP
What are the performance gains between muffler mod vs cat back vs axle back vs stock with golf tee mod in a car with cattless DP???
The stock E92 2.25" x 2 piping has little resistance and I'd hate to spend $1,200~2,500 on exhaust, get only 2whp and have pull me over/ricer loud exhaust.
I know I'm asking a lot, but it would help people figure out the utility/value of an exhaust mod or upgrade…
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