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M-Series (M1, M3, M5, M6) General M-Series Discussion - If it does not fit into a more specific M Category above, please place it in here. In addition, previously archived M-Series discussion is located in this section.

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Old 02-15-2010, 05:28 PM   #1 (permalink)
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test pipes on 99

hey i was just wondering what exactly should i be expecting from eisenmann test pipes. car is a five speed and stock but should be getting cosmos intake very soon. i will be getting a full cat back exhaust soon also from eisenmann but i can't get that as of right now i am only going to be getting the test pipes. so would fitment be ok with the test pipes and stock catback?? and what gains or losses should i expect from these and will it make my car sound any different?? like louder, or will the tone of the car be affected and should i be expecting backfire?? thanksss
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Old 02-17-2010, 01:29 AM   #2 (permalink)
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oh yea, and i don't want any CELs going off what could i do about it. was planning on chip in future most likely jim conforti
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Old 03-13-2010, 07:39 PM   #3 (permalink)
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Cat back exhaust

I just did the reverse, I kept the stock cats and installed a Rogue Engineering DMS 36 catback exhaust. I wanted to keep the DB down since I still drive on the street occasionally. The exhaust helped significantly at higher RPM's the dyno indicate 5-7 HP on consecutive runs.

Then I installed a chip (ebay clone), moves the redline to 7200 and increases fuel flow at top end, plus removes the top speed limiter. This change gave me another 12-15 hp at top end on the dyno. So the pair gave me an honest 20hp at the wheels.

I personally believe the muffler represent far more restriction on the exhaust than the cats, so I did this first.
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