Who needs a secondary cat delete...

tcw · 06-24-2013, 11:35 AM

When you can do this!

Looks like the two-step and single turbo were not a good match for the mid-cats. This is just one, the other one had a smaller hole and some cracks as well. I replaced them with some Vibrant 1790 resonators (stock exhaust). Although, it looks like I could have just finished destroying these.

FWIW I have not smelled gas around my car (other than a little on cold starts when backing out a closed garage) nor seen smoke in my rearview. And I don't expect this to change seeing after my cats were not doing much anyways.

3000GT MR · 06-24-2013, 11:56 AM

Your mufflers probably sounds like a rain sticks. Usually in a case like this you'll hear popping noises coming from the exhaust. The Little pieces popping like popcorn. I would say if you have a single you might want to invest in an aftermarket exhaust. To me that looks like a bad case of back pressure which adds a lot of heat.

tcw · 06-24-2013, 12:07 PM

Haha, had to look that up. http://en.wikipedia.org/wiki/Rainstick

I think any pieces of the cat should have went out the tailpipe.

06-24-2013, 11:35 AM	#1
tcw Captain 52 Rep 748 Posts Drives: 2008 335i Join Date: Jan 2012 Location: Atlanta, GA iTrader: (2)	Who needs a secondary cat delete... When you can do this! Looks like the two-step and single turbo were not a good match for the mid-cats. This is just one, the other one had a smaller hole and some cracks as well. I replaced them with some Vibrant 1790 resonators (stock exhaust). Although, it looks like I could have just finished destroying these. FWIW I have not smelled gas around my car (other than a little on cold starts when backing out a closed garage) nor seen smoke in my rearview. And I don't expect this to change seeing after my cats were not doing much anyways. __________________ 2008 335I E92, AW, VFF700, 18" Forgestar F14, M3 front/side, M-tech rear, AMS IC, H&R Touring Cup Kit suspension, HID AE, ER Charge Pipe & Synapse BOV, CIC Retrofit, Quafie, DSS, Defiv Lockdown, SPEC 2+/Steel SMFW, Walbro 450
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06-24-2013, 11:56 AM	#2
3000GT MR Major 265 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	Your mufflers probably sounds like a rain sticks. Usually in a case like this you'll hear popping noises coming from the exhaust. The Little pieces popping like popcorn. I would say if you have a single you might want to invest in an aftermarket exhaust. To me that looks like a bad case of back pressure which adds a lot of heat. __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits! 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
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06-24-2013, 12:07 PM	#3
tcw Captain 52 Rep 748 Posts Drives: 2008 335i Join Date: Jan 2012 Location: Atlanta, GA iTrader: (2)	Haha, had to look that up. http://en.wikipedia.org/wiki/Rainstick I think any pieces of the cat should have went out the tailpipe. __________________ 2008 335I E92, AW, VFF700, 18" Forgestar F14, M3 front/side, M-tech rear, AMS IC, H&R Touring Cup Kit suspension, HID AE, ER Charge Pipe & Synapse BOV, CIC Retrofit, Quafie, DSS, Defiv Lockdown, SPEC 2+/Steel SMFW, Walbro 450
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