Catless DP's

WhiteOne · 05-03-2008, 11:57 PM

Would putting catless DP's on an otherwise stock car make any difference? Spool faster? Last longer? Little louder? Run cooler? What do you think...

ktdw · 05-04-2008, 12:30 AM

I just put the RR Catless DPs on my car today. Though it was not "otherwise stock", the biggest difference I noted was the sound:

You can definetly hear the turbos spool much more.
It is maybe a little louder, but not by much.
The sound is more "raw" (probably the best way to describe it), but not raspy.
IMO, At higher RPMs it sounds kinda exotic.
I didn't notice any oder, though it was windy today.
I like it!

Honestly, I can't tell if it added more power, or that the sound makes me feel like there's more power. I guess it's pretty cool either way.

I was going to take some video of it, but I knew the wind would ruin the sound quality. Maybe tomorrow...

E82tt6 · 05-04-2008, 01:17 AM

Big sound difference!

On a stock car you should pick up at least 20rwhp, after you give the car a couple runs to adjust. Enough that your butt dyno should be just about able to pick it up. Think 50* vs 80*

Riss Racing · 05-04-2008, 09:59 AM

29 whp 49 tq were Over stock with the Riss Racing Catless DPs. Power, and sound are it's best qualities.

rcracer_tx · 05-04-2008, 11:08 AM

Quote:

Originally Posted by anthony@rissracing

29 whp 49 tq were Over stock with the Riss Racing Catless DPs. Power, and sound are it's best qualities.

Will your catless DP void the factory warranty?

jbenington86 · 05-04-2008, 05:22 PM

Quote:

Originally Posted by rcracer_tx

Will your catless DP void the factory warranty?

keep your old crap and slap it back on :biggrin:

E82tt6 · 05-04-2008, 07:42 PM

Quote:

Originally Posted by rcracer_tx

Will your catless DP void the factory warranty?

Depends on your dealer.

Legally, no.

Pratically, maybe.

coco_m3 · 05-04-2008, 08:48 PM

Legally?

malves85 · 05-04-2008, 08:52 PM

Legally they have to prove your mod caused whatever problem the car is in for. Pratically the salesman and whoever else will tell you the second you touch your car the warranty is voided. The only time you have to worry about DPs maybe voiding warranty is if your car goes in for warranty work on the engine. If you go in for oil changes or just basic stuff theres nothing to worry about. I never installed DPs but it seems like they are bolt on and dont take too long to put the factory ones back on.

Rearro · 05-05-2008, 02:05 AM

if you install RR Down pipes will Dinan void their warranty??
does anyone know??

E82tt6 · 05-05-2008, 02:22 AM

Quote:

Originally Posted by Rearro

if you install RR Down pipes will Dinan void their warranty??
does anyone know??

I'd count on it. Dinan warranty specifically states aftermarket parts from other makers=no warranty.

mrgoochio · 05-05-2008, 02:58 AM

Well it's illegal to run cat-less in California. Every car has to be running the original stock cat unless deemed damaged and unable to function properly by a licensed inspector. You're not even allowed to swap out for hi-flow cats unless approved by said inspector.. Refer to your local laws. Maintenance wise, it's always a toss-up on what they feel like saying.

vivid · 05-05-2008, 07:16 AM

Quote:

Originally Posted by mrgoochio

Well it's illegal to run cat-less in California. Every car has to be running the original stock cat unless deemed damaged and unable to function properly by a licensed inspector. You're not even allowed to swap out for hi-flow cats unless approved by said inspector.. Refer to your local laws. Maintenance wise, it's always a toss-up on what they feel like saying.

its pretty much that way all over the country...

05-03-2008, 11:57 PM	#1
WhiteOne Major 28 Rep 1,000 Posts Drives: 2008 AW 135i Join Date: Dec 2007 Location: Alabama iTrader: (0)	Catless DP's Would putting catless DP's on an otherwise stock car make any difference? Spool faster? Last longer? Little louder? Run cooler? What do you think...
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05-04-2008, 12:30 AM	#2
ktdw BMWCCA #401908 54 Rep 470 Posts Drives: 135i Join Date: Apr 2008 Location: Bay Area iTrader: (0)	I just put the RR Catless DPs on my car today. Though it was not "otherwise stock", the biggest difference I noted was the sound: You can definetly hear the turbos spool much more. It is maybe a little louder, but not by much. The sound is more "raw" (probably the best way to describe it), but not raspy. IMO, At higher RPMs it sounds kinda exotic. I didn't notice any oder, though it was windy today. I like it! Honestly, I can't tell if it added more power, or that the sound makes me feel like there's more power. I guess it's pretty cool either way. I was going to take some video of it, but I knew the wind would ruin the sound quality. Maybe tomorrow... __________________ Vishnu PROcede v3, Vishnu Dual Cone Intake, Code3 FMIC, Riss Racing Downpipes, Riss Racing Exhaust, H&R Sport Springs Best 1/4 mile: 12.583 @ 117.609 mph
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05-04-2008, 01:17 AM	#3
E82tt6 Colonel 103 Rep 2,626 Posts Drives: '08 Black Saphire Z4 MC Join Date: Oct 2007 Location: New Jersey iTrader: (0)	Big sound difference! On a stock car you should pick up at least 20rwhp, after you give the car a couple runs to adjust. Enough that your butt dyno should be just about able to pick it up. Think 50* vs 80* __________________ '08 Black Saphire/Black Z4 M Coupe RIP Gretta: Blue Water/Lemon 135i. Died to save me. -ChuckV
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05-04-2008, 09:59 AM	#4
Riss Racing Banned 276 Rep 2,650 Posts Drives: E60 M5/E92 335/HUMMER H2 Join Date: Jun 2007 Location: Irvine, CA iTrader: (7)	29 whp 49 tq were Over stock with the Riss Racing Catless DPs. Power, and sound are it's best qualities.
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05-04-2008, 08:48 PM	#8
coco_m3 Brigadier General 167 Rep 4,311 Posts Drives: Supercharged E90 M3 Join Date: Mar 2008 Location: SL,UT iTrader: (1) Garage List 2008 BMW M3 [0.00] 2010 BMW E90 335i [0.00]	Legally? __________________
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05-04-2008, 08:52 PM	#9
malves85 Second Lieutenant 6 Rep 255 Posts Drives: Join Date: Feb 2008 iTrader: (0)	Legally they have to prove your mod caused whatever problem the car is in for. Pratically the salesman and whoever else will tell you the second you touch your car the warranty is voided. The only time you have to worry about DPs maybe voiding warranty is if your car goes in for warranty work on the engine. If you go in for oil changes or just basic stuff theres nothing to worry about. I never installed DPs but it seems like they are bolt on and dont take too long to put the factory ones back on.
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05-05-2008, 02:05 AM	#10
Rearro Lieutenant 24 Rep 507 Posts Drives: Bmw 135I Join Date: Nov 2007 Location: Silverdale, Wa. iTrader: (0)	Dinan & Riss racing Dp's if you install RR Down pipes will Dinan void their warranty?? does anyone know?? __________________ 2008 135i,Dinan Stage 2,Dinan Free flow exhaust.
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05-05-2008, 02:58 AM	#12
mrgoochio 135i Coupe Owner! 46 Rep 1,009 Posts Drives: 2008 BMW 135i Coupe Join Date: Oct 2007 Location: Los Angeles iTrader: (0)	Well it's illegal to run cat-less in California. Every car has to be running the original stock cat unless deemed damaged and unable to function properly by a licensed inspector. You're not even allowed to swap out for hi-flow cats unless approved by said inspector.. Refer to your local laws. Maintenance wise, it's always a toss-up on what they feel like saying. __________________ 2008 BMW 135i Coupe Jet Black Sport Pkg. P1 Lemon Boston Leather High Gloss Black Trim Comfort Access System
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