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      05-14-2020, 05:34 AM   #23
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Drives: 2012 E92 M3 ZCP Mineral White
Join Date: May 2014
Location: Upstate NY

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Originally Posted by Ashley_rj View Post
Hi Guys,

I have a Harrop s/c e90 M3.
I have the full stock exhaust system at the moment but would like to switch to a high flow alternative. I am also a bit of an eco warrior (hypocritical I know) so don't want to go the decat route as this is my daily driver.
I would like more power (probably unnecessary as there are 490rwbhp).
There is very little info I can find about replacing the primary cats other than test pipes.

I have found that Cobra make a high flow cat'd front exhaust/up pipe/1st section or what ever it is called. As does supersprint, but I cannot find out any information as to whether this will give me some extra hp, be worth while, terribly affect my emissions.

A further option that I don't see why couldn't be done would be to cut out the primary cats and to weld in some GreenCat's or Magniflow's. If done well I dont see why that would not be a viable option???

Harrop does have a tune for a decatted exhaust, unfortunately the current staff there don't seem to be very clued up, so I have lost a bit of faith in their advice.

I would consider doing the rest of my exhaust also and will probably go for M3 world's x pipe and valved rear section.

Any info or opinions would be appreciated.
Cheers, Ash

Have you looked at the Fabspeed setup?
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      05-14-2020, 07:05 PM   #24

Drives: E90 ZCP
Join Date: Dec 2007
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Supposedly the Fabspeed cats scrape since they are round and in the primary spot. The primary spot really needs a pancake shaped cat, otherwise it'd either scrape or be too small to be that effective.
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      05-14-2020, 08:16 PM   #25
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Drives: e90 M3 2009 harrop s/c
Join Date: Mar 2019
Location: Melbourne

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Originally Posted by wyatth View Post
Great!! thanks for the link looks like some very similar discussions going on!
2009 e90 M3 Harrop s/c
2006 golf GTI stage 1
2018 Triumph Street triple RS
1999 e36 M3 convertible-sold
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cat, catalytic converter, e9x m3, exhaust, front exhaust, harrop, supercharger, up pipe

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