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Old 05 Aug 2009, 07:04 PM   #1 (permalink)
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exhaust help

hi, im pretty new to scoobies so bear with me,
i was looking to buy a decat down pipe for a classic wagon, and its 3" diameter, will this join with no problems to a 2.5"decat middle section? are all the fitting where they join the same size? (i mean where you bolt them together)
thanks
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Old 05 Aug 2009, 07:06 PM   #2 (permalink)
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Re: exhaust help

you mean the flanges??

should all bolt up nicely..
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Old 05 Aug 2009, 07:11 PM   #3 (permalink)
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Re: exhaust help

thanks pilot!! cool put a smile on my face!!!!!!!!!!
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Old 18 Dec 2009, 08:44 PM   #4 (permalink)
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Re: exhaust help

hi i have a decat 3" system and need to put a cat on for mot boooooo anyway similar to slippo's question, i presume all aftermarket exhaust systems have 2.5" flanges on them although the system is actually 3"? Any help would be greatly appreciated. Its a 94 Jap import wrx so only cat needed on downpipe i understand.
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Old 18 Dec 2009, 08:57 PM   #5 (permalink)
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Re: exhaust help

1 or 2 systems have slip joint TSL and Revolution I know do but the majority of exhausts will come with flanges for ease of installation, so if your system is cat back you should be able to pop a cat back in, have you decat`d the downpipe ? if so is it a 1 piece now ? if you still have a cat in the downpipe you dont need to put the 2nd cat back in.
hth
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Old 18 Dec 2009, 09:08 PM   #6 (permalink)
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Re: exhaust help

there isnt a single cat in the system, thats how i baught the car tbh. i can get a downpipe with cat no probs, but the flanges are 2.5" but my system is 3" throughout from turbo down. Just wanted to check that all flanges and all aftermarket systems were 2.5" if anyone knew, i would presume they are. thanks Gareth
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Old 18 Dec 2009, 09:35 PM   #7 (permalink)
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Re: exhaust help

I had same issue with my car, bought it with 3" stainless complete decat system. Had to get a cat for the MOT and the standard ones do not fit. I ended up getting a stainless section made for 200. Have a look in my albums in my profile for the pics.
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Old 18 Dec 2009, 10:01 PM   #8 (permalink)
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Re: exhaust help

Matt, what bit didnt fit? Were the flanges different? They are in the same places as a standard system, so each section of the pipe is the same size just 3"?
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