Catless DP and HKS Exhaust

UAP1 · 03-17-2010, 10:41 PM

I am currently running the HKS Cat back system. Still has cats on.

Anybody have this set up with Catless DP?

I am thinking about going the Catless DP route. Wanted to hear feedback on peoples results and feeback on their experience.

Syndicategt · 03-17-2010, 10:42 PM

Cattless DP's add a very nice gain in power! You will notice the extra HP right away, unlike some other mods where it's not very noticeable. They do not change the sound too much, maybe a little deeper. My favorite part was how fast the turbos spool up, very noticeable. You won't regret them

UAP1 · 03-17-2010, 10:44 PM

Quote:

Originally Posted by Syndicategt

Cattless DP's add a very nice gain in power! They do not change the sound too much, maybe a little deeper. My favorite part was how fast the turbos spool up, very noticable. You won't regret them

I was reading the other Catless DP threads. Seems like a great mod!

I was curious if people ran the HKS Catback with Catless DP. Which one? Feedback?

cn555ic · 03-17-2010, 10:56 PM

Quote:

Originally Posted by Syndicategt

Cattless DP's add a very nice gain in power! You will notice the extra HP right away, unlike some other mods where it's not very noticeable. They do not change the sound too much, maybe a little deeper. My favorite part was how fast the turbos spool up, very noticeable. You won't regret them

Your right for Sure there is definitely a change in sound...turbo spool is so much more audible after going catless! Even a tap in the gas you here it a little!

Syndicategt · 03-17-2010, 11:37 PM

Here's a Youtube clip of HKS and AR Dp's. You can really hear the turbos spool up.

UAP1 · 03-18-2010, 12:14 AM

Quote:

Originally Posted by Syndicategt

Here's a Youtube clip of HKS and AR Dp's. You can really hear the turbos spool up.

Awesome! Thanks!

Gen_E92 · 03-18-2010, 12:58 AM

i should have a sound clip by next week

UAP1 · 03-18-2010, 12:13 PM

Quote:

Originally Posted by Gen_E92

i should have a sound clip by next week

Sweet! Keep us in the loop.

Also, let us know your feedback on performance difference.

ar design · 03-18-2010, 12:37 PM

Former Boosted has our catless downpipes + HKS..... I will send him this link.... ask him to chime in.

UAP1 · 03-18-2010, 12:41 PM

Quote:

Originally Posted by ar design

Former Boosted has our catless downpipes + HKS..... I will send him this link.... ask him to chime in.

Awesome! Thanks AR!

psu139 · 03-18-2010, 12:46 PM

I have the Cp-e catless and the hks. at 65 it has some drone, not much but it is there. and yes its a nice bump in power.

import36 · 03-18-2010, 01:00 PM

FBIS has this setup i believe...he'll be able to chime in.

Chefcg1 · 03-18-2010, 01:12 PM

Is there much of a gain going the otherway. By that I mean I have catless DP's now with stock exhaust, is there much inprovement going to the catless HKS exhaust?

UAP1 · 03-18-2010, 01:48 PM

Quote:

Originally Posted by Chefcg1

Is there much of a gain going the otherway. By that I mean I have catless DP's now with stock exhaust, is there much inprovement going to the catless HKS exhaust?

Good question too.

mwahlert · 03-18-2010, 06:57 PM

the big gains are in the downpipes but removal of all cats obviously is the way to go if you are looking for max power gains.

Brey335i · 03-18-2010, 09:29 PM

removal of all cats is a big commitment; the smell is pretty terrible

cn555ic · 03-18-2010, 10:15 PM

It does smell, but nothing like the rotten egg smell, now that would be really terrible!

lamia2super · 03-18-2010, 11:58 PM

Quote:

Originally Posted by Brey335i

removal of all cats is a big commitment; the smell is pretty terrible

I dont even notice it. I have to be standing behind the car to smell anything and it just smells like gas.

Rockstarr · 06-11-2010, 07:24 PM

I just got my HKS exhaust installed today (AT) and I have catless DPs. Overall the install went ok with a couple of minor hiccups.

The car feels great however I have drone on light throttle between 1500 & 2000 rpm. I will probably have some install some hi-flow cats to see if that helps.

AlpineG05 · 06-11-2010, 08:16 PM

Catless downpipes with the stock exhaust sounds good IMO so with an aftermarket exhaust I'm sure it'll sound awesome.

03-17-2010, 10:41 PM	#1
UAP1 www.UltimateAutoPortal.co m 62 Rep 556 Posts Drives: 2007 BMW 335i. Few mods. Join Date: Mar 2010 Location: Texas iTrader: (3)	Catless DP and HKS Exhaust I am currently running the HKS Cat back system. Still has cats on. Anybody have this set up with Catless DP? I am thinking about going the Catless DP route. Wanted to hear feedback on peoples results and feeback on their experience.
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03-17-2010, 10:42 PM	#2
Syndicategt Brigadier General 164 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	Cattless DP's add a very nice gain in power! You will notice the extra HP right away, unlike some other mods where it's not very noticeable. They do not change the sound too much, maybe a little deeper. My favorite part was how fast the turbos spool up, very noticeable. You won't regret them __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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03-17-2010, 11:37 PM	#5
Syndicategt Brigadier General 164 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	Here's a Youtube clip of HKS and AR Dp's. You can really hear the turbos spool up. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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03-18-2010, 12:58 AM	#7
Gen_E92 Brigadier General 120 Rep 3,430 Posts Drives: slow Join Date: Oct 2006 Location: Vancouver iTrader: (17) Garage List 2007 335i [7.80]	i should have a sound clip by next week
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03-18-2010, 12:37 PM	#9
ar design 302 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	Former Boosted has our catless downpipes + HKS..... I will send him this link.... ask him to chime in. __________________ -Critter
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03-18-2010, 12:46 PM	#11
psu139 First Lieutenant 25 Rep 340 Posts Drives: F10 M5 Join Date: Apr 2007 Location: Glenwood, MD iTrader: (1)	I have the Cp-e catless and the hks. at 65 it has some drone, not much but it is there. and yes its a nice bump in power.
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03-18-2010, 01:00 PM	#12
import36 Burrito bowl connoisseur 133 Rep 3,501 Posts Drives: 2015 Nissan GTR Black Edition Join Date: Feb 2008 Location: Seven Cities iTrader: (1)	FBIS has this setup i believe...he'll be able to chime in. Last edited by import36; 03-18-2010 at 01:02 PM.. Reason: oops...just saw Andrew's post. <slap>
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03-18-2010, 01:12 PM	#13
Chefcg1 Major 72 Rep 1,137 Posts Drives: 2008 BMW 335i Join Date: Apr 2009 Location: Mount Airy, NC iTrader: (6)	Is there much of a gain going the otherway. By that I mean I have catless DP's now with stock exhaust, is there much inprovement going to the catless HKS exhaust? __________________ 2008 335i coupe AW 6AT, RB Turbos, PROcede 2.5 V5, Alpina Flash, Injen Intake, VK MW DP . Helix IC, Vishnu PnP Meth(M10 nozzel), M3 sides, OEM Aero Lip, VMR V710 Midnight Blue, LUX H8, HID Fogs, M3 front bits, D2 Coilovers, Whiteline Rear Bushing inserts, Custom M3 Steering Wheel, Cyba scoops, M2 Performance Exhaust
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03-18-2010, 06:57 PM	#15
mwahlert Lieutenant Colonel 97 Rep 1,659 Posts Drives: 2009 335i Join Date: Apr 2008 Location: NC iTrader: (8)	the big gains are in the downpipes but removal of all cats obviously is the way to go if you are looking for max power gains.
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03-18-2010, 09:29 PM	#16
Brey335i Banned 118 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	removal of all cats is a big commitment; the smell is pretty terrible
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03-18-2010, 10:15 PM	#17
cn555ic 460 Rep 18,331 Posts Drives: 335i Join Date: Jun 2007 Location: US iTrader: (6)	It does smell, but nothing like the rotten egg smell, now that would be really terrible!
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06-11-2010, 07:24 PM	#19
Rockstarr Private 4 Rep 79 Posts Drives: 2020 F33 440ix Join Date: Feb 2009 Location: NJ iTrader: (2)	I just got my HKS exhaust installed today (AT) and I have catless DPs. Overall the install went ok with a couple of minor hiccups. The car feels great however I have drone on light throttle between 1500 & 2000 rpm. I will probably have some install some hi-flow cats to see if that helps.
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06-11-2010, 08:16 PM	#20
AlpineG05 hi 212 Rep 1,212 Posts Drives: Alpine White G80 Comp Join Date: Feb 2008 Location: Bakersfield, Cali iTrader: (1)	Catless downpipes with the stock exhaust sounds good IMO so with an aftermarket exhaust I'm sure it'll sound awesome. __________________ 2022 M Sport G05 Jb4, CTS catless dp, M performance exhaust, bms intake, IND goodies, Maxton kit
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