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QUESTION: Straight midpipe or X-pipe w/connecting pipes?
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| 02-18-2011, 01:48 AM | #1 |
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QUESTION: Straight midpipe or X-pipe w/connecting pipes?
I'm about to get a Procede tune and I'm currently running stock downpipes, midpipes, and a Remus race axle-back exhaust.
I understand downpipes are a great upgrade for performance but I defintely won't pass smog. So I'm thinking about freeing up some air flow in the mid section and getting a better sound by replacing the stock midpipe which has the secondary cats and resonator. Do I go with straight midpipes (Borla or SuperSprint) or an X-pipe with connecting pipes? I'm not sure what the diff would be but the x-pipe set up is more expensive? 
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2007 335i e90 - black on black w/wood trim and iDrive
19" BMW M-Performance wheels, ST coilovers, m3 rep front bumper and skirts, CF Hamann rep diffuser, Remus Race quad exhaust, aFe DCI, LED angel eyes & DRL kit, |
| 02-18-2011, 01:55 AM | #2 |
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Lieutenant Colonel
 
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Straight. No point trying to scavenge when increased flow will help relieve turbo stress.
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| 02-18-2011, 02:45 AM | #3 |
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Major
 
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Drives: E90 335i LCI
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effects are minimal so go with straight pipes; its cheaper too
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| 02-18-2011, 02:55 AM | #4 |
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Second Lieutenant
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any recommendations on a brand of straight pipes?
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2007 335i e90 - black on black w/wood trim and iDrive
19" BMW M-Performance wheels, ST coilovers, m3 rep front bumper and skirts, CF Hamann rep diffuser, Remus Race quad exhaust, aFe DCI, LED angel eyes & DRL kit, |
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| 02-18-2011, 02:59 AM | #5 |
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go to your muffler shop and get custom pipes!
no one blows $300 on borla or RR midpipes
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| 02-18-2011, 03:01 AM | #6 |
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how much would that cost?
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2007 335i e90 - black on black w/wood trim and iDrive
19" BMW M-Performance wheels, ST coilovers, m3 rep front bumper and skirts, CF Hamann rep diffuser, Remus Race quad exhaust, aFe DCI, LED angel eyes & DRL kit, |
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| 02-18-2011, 04:40 AM | #7 |
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if you are just cutting exactly where the secondary cats are, and welding straight pipes on then its gonna be like what? $60 bucks?
if you are bending new pipes from the downpipe to the secondary cats (basically creating your own midpipes) it would cost you around $150-200?
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