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Author Topic: Milltek Sports Cat and Downpipe linked to a standard back box ?  (Read 4890 times)

Offline Britishlion

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Milltek Sports Cat and Downpipe linked to a standard back box ?
« on: February 23, 2011, 06:19:40 pm »

Evenin All !  :happy2:

Just bought Mandy's exhaust (Thanks Mandy) and noticed JKM have advised not to attach to standard back box ?

why would this be, as this was my plan ? surely if the down pipe is 2.75 and the back box is 2.75 what would the problem be ?

Anybody got any thoughts ?   :popcornsoda:


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Offline PDT

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #1 on: February 23, 2011, 06:20:56 pm »
You will need a reducer  :wink:
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Offline Beddie

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #2 on: February 23, 2011, 06:24:50 pm »
'Aparoon' on here ran a Pipewerx cat/DP on his standard cat back system with absolutely no problems, but did have to have a reducer as PDT says  :happy2:
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Offline Britishlion

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #3 on: February 23, 2011, 06:26:58 pm »


Thanks guys, I guess the garage will have a reducer, i was sure i had read of people running just DP attached to standard !
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Offline Britishlion

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #4 on: February 23, 2011, 06:48:14 pm »
Demon tweaks website also say DO NOT fit with standard !


 :confused: :confused: :confused:

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Offline martziniuk

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #5 on: February 23, 2011, 07:14:44 pm »
I run a 3"decat down to a standard system with no issues. I had a cone reducer welded onto the decat pipe.
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Offline craig_t

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #6 on: February 23, 2011, 07:17:18 pm »
It depend who you ask to which answer you get.

I am in a similar situation with a pipe werx down pipe. Some garage tell me that I really shouldn't mate it up to my stock cat back as it may bottle neck the gases at the reducer.

Other people say it will be completely fine and have had no problems.

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Offline Mandy

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #7 on: February 23, 2011, 07:18:00 pm »
I think it will be ok, as lots of people do it with no probs. It's just not 'recommended' by Milltek, but obviously they'd prefer you to use their back box wouldn't they.  :smiley:
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Offline Janner_Sy

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #8 on: February 23, 2011, 07:19:51 pm »
Quote from: Britishlion on February 23, 2011, 06:19:40 pm

Evenin All !  :happy2:

Just bought Mandy's exhaust (Thanks Mandy) and noticed JKM have advised not to attach to standard back box ?

why would this be, as this was my plan ? surely if the down pipe is 2.75 and the back box is 2.75 what would the problem be ?

Anybody got any thoughts ?   :popcornsoda:


nothing wrong with mating a 2.75" DP to a standard cat back. I had  a 3" dp mated to mine with zero issues.



the ONLY reason they say that is because they make more money when you buy a TBE system instead of a just a downpipe

the pipewerx DP has a built in reducer by the way so its a direct fit
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Offline TrickGTI

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #9 on: February 23, 2011, 07:19:57 pm »
 :jumpmove:
Quote from: Britishlion on February 23, 2011, 06:48:14 pm
Demon tweaks website also say DO NOT fit with standard !


 :confused: :confused: :confused:




it will be just a case of DONT DO IT, and while your here why don't you just spend another 500 for the rest of the system its for the best really...
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Offline Janner_Sy

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #10 on: February 23, 2011, 07:21:11 pm »
AMD tried getting me to fit a miltek cat back when they fitted my HPFP because it could release a good 10Hp :grin: :grin: :grin:
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Offline Britishlion

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #11 on: February 23, 2011, 07:36:00 pm »
Quote from: Janner_Sy on February 23, 2011, 07:21:11 pm
AMD tried getting me to fit a miltek cat back when they fitted my HPFP because it could release a good 10Hp :grin: :grin: :grin:

Ha ha ! Am I right in saying any garage will have a reducer or do I need to find one ?

Will I get a sound change from the exhaust or is that only cat back that produces this ?
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Offline Janner_Sy

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #12 on: February 23, 2011, 07:37:44 pm »
i had a notable change in exhaust note after fitting the downpipe.  Much deeper burble and slightly louder.  The cat back IMO ruined my car, all it does is let everyone within a 2 mile radius know when your speeding

i will never fit a cat back again
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Offline Britishlion

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #13 on: February 23, 2011, 07:41:44 pm »
My old r1 was like that when I fitted an akropovic exhaust.

Sounded awesome, but when you let it go, everyone knew about it ! Including the police!

Not that I ever speeded of course  :innocent:
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Offline chungster

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Re: Milltek Sports Cat and Downpipe linked to a standard back box ?
« Reply #14 on: February 23, 2011, 07:53:22 pm »
IIRC vRStu had a DP/Sports Cat with OE Cat Back on his S3 and made some mighty numbers with it at SRR.  :happy2:
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