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      10-09-2021, 02:47 AM   #1

Drives: 335i, 328i
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MHD stage2+ W out DP??? NO EXHAUST

I was wondering if I really needed Downpipes on my 2007 335i e92 on mhdstage2+

I already have the following

Vrsf FMIC, Vrsf chargepipe+BOV, BMS dualcones, 1step colder sparks, Bosch coils, silicone inlets. However my car does not have downpipes, my exhaust is cut off where my secondary CATs would be. So it has no muffler, res, or 2ndary cats. Could I possibly run a tune like stage 2+? If it says I need downpipes itís prolly for extra flow. bc stock cats would block it. but I have mine removed. Iím just wondering. Iím new to exhaust work and flow. Ty.
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      10-26-2021, 03:22 PM   #2
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Drives: 2007 BMW 335i E90
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You definitely won't see the same performance as if you had a catless downpipe as it does inhibit the flow. I believe you could run it, but your cats will burn up or blow out their internals eventually. Better to just sell your stock cats as they will more than cover the cost of proper catless downpipes.

An alternative would be to take off your downpipes and bust out the internals, but as I said, might as well sell the OEM pipes, get legit catless downpipes.
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