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BMW 3-Series (E90 E92) Forum
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Finally! Riss Racing Downpipes for 335.. Amazing Power Gains and Info Inside!
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06-30-2007, 03:47 AM | #67 |
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06-30-2007, 04:24 AM | #69 |
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06-30-2007, 04:44 AM | #70 |
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I just came back from charlies house, and I can vouch for the power gains.
Saw the videos of the dynos and the power gains are amazing. I cant wait for the manufactured peices to come out, im sure they will be top notch. Seems like some very promising product.
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06-30-2007, 04:46 AM | #71 |
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Can't wait to get one
CEA any ETA????
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06-30-2007, 04:51 AM | #72 |
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06-30-2007, 05:41 AM | #73 |
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hmm nice gains, cant say i like that you removed the cats , but nice besides that
you have an exhaust though right? there are plans on dynoing it on a stock car before its released right |
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06-30-2007, 07:34 AM | #74 |
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+1 on that! I'll wait for something that incorporates high-flow Cats before I think about changing the DPs. I didn't mind gutting the pre-cats on the S4 because the main cats were still fully functional and I still gained 20whp. But I'm not as concerned in beating the guy in the next lane as I am in trying to be a little environmentally conscious. [/treehuggermode]
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06-30-2007, 07:38 AM | #75 |
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good stuff.... keep me updated on it
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06-30-2007, 07:53 AM | #76 |
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great job! cant wait to get these. sign me up.
cea-added you to aim.
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06-30-2007, 08:34 AM | #77 |
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But how much more boost is being produced? There should be much higher spikes without a pre-cat. Presumably a piggyback would need to be re-tuned for this.
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06-30-2007, 08:48 AM | #78 |
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These gains are not surprising. Take a look at other turbo cars that have their pre-cats removed. However, some or most of this additional power may be coming from the resulting higher boost spikes. The question is, how high does pressure spike now?
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06-30-2007, 09:08 AM | #79 |
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So, for someone who doesnt want to take the cats out, just get the down pipes, how much are we looking at in terms of gains if you had to guess CEA.
Also how long is the install? Is it really involved? Im very curious, as I want to see what my Procede would put out with down pipes, as Im running 93 octane. But I dont want to touch the cats, I like the low key exhaust volume and tone I have now. How much louder would it be, with the stock cats still on there?
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06-30-2007, 09:13 AM | #80 |
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Does this will fit also the touring version E91 335i?
Thanks. Last edited by issorcio; 06-30-2007 at 09:02 PM.. |
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06-30-2007, 09:32 AM | #81 | |
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Quote:
You said it will have 2 02 sensor on the aftermarket downpip. Is this O2 sensor a dumbing sensor so it would not throw engine code? hey have you try to see if it pass the state Emission .....When time to smog check, i dont need to replace them. |
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06-30-2007, 09:33 AM | #82 |
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Im in depending on price. Wow this is awesome.
I definitely want to retain my stock exhaust though since this is my daily driver. Im tired of loud exhaust. I know on the Audi's, putting on a DP(or testpipe) would make the exhaust sound extraordinarily louder. Will it just make stock exhaust throatier or will it make it annoying? Thanks man!
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06-30-2007, 09:39 AM | #83 |
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there is absolutely no chance of it passing smog tests dude
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06-30-2007, 09:48 AM | #84 |
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06-30-2007, 10:36 AM | #86 |
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CEA for president!!!!!!!
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06-30-2007, 10:38 AM | #87 |
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The stock primary cats are in the DP. Once removed it is highly unlikely that the car will pass a smog test however since they are bolt ons and you only have to smog once every 4 years or so (in Cali) it is a non-issue here. What I dont understand is why the car doesn't throw a CEL
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