2.5 manifold onto a mk2

by **Merlot man** » Wed, 11 May 2016 1:43 +0000

Hello all
i'm considering changing the manifold and down pipe on my 1.8 mk2 to a 2.5 version as I understand , from keith tannars book, it gives a small power boost to a normally aspirated car and was wondering if the 2.5 manifold and down pipe are a straight swap to the mk2 head and mk2 centre section . I don't wish to change the centre section as its a quality s/s system .
Thanks in advance
Brian

by **Real Rayzor** » Wed, 11 May 2016 4:04 +0000

I happened across this today on nutz Brian. I think it should answer your question.
http://www.mx5nutz.com/forum/index.php? ... getnewpost

by **davith501** » Wed, 11 May 2016 4:34 +0000

2.5 manifold is better quality and has better flow compared to mk2 and is a direct swap to the block. Unfortunately, as far as I remember, downpipe and mid sections are different. Mk2.5 has cat on the downpipe +mid section with silencer and mk2 has downpipe +mid section with cat and silencer. Different lengths and angles would require cutting and joining if you want to keep your existing mid section. Possible but some fiddling required.. Don't think that is what you're after..

by **Merlot man** » Wed, 11 May 2016 5:10 +0000

Thanks gents that's what I thought myself .
Anyone after a quality s/s mk2 mid section with cat and silencer !
Brian

by **MX5Spares** » Wed, 11 May 2016 5:13 +0000

Hi Brian ,they will not swop without centre section ,as above.

by **Billium94** » Wed, 11 May 2016 11:34 +0000

Hi Brian,

I might actually be interested in that mid section if you do decide to get rid of it! I've a hole starting to come in my own one!

Bill

by **MX5Spares** » Thu, 12 May 2016 4:55 +0000

Hi Brian, we have the front manifold section ,with cat ,and mid section but not stainless only standard mild steel.

by **Merlot man** » Thu, 12 May 2016 10:51 +0000

Thanks Robert , if I was going to go for this idea it would you I'd be talking to , if you ever get these in S/S please let me know .
Bill thanks for the interest but i'll keep what I have for now , my advice is to talk to Robert , I'm sure he has some standard ones ; it would be cheaper and easier than a repair , I got this S/S item from him so worth a phone call !
Thanks to everyone for their posts and advice
Brian

by **Billium94** » Thu, 12 May 2016 11:43 +0000

My own one is fine for now Brian, I'd only really change it if I could get a S/S one but I'm in no rush with it!

Thanks,
Bill

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	Author Message 2.5 manifold onto a mk2 by Merlot man » Wed, 11 May 2016 1:43 +0000 Hello all i'm considering changing the manifold and down pipe on my 1.8 mk2 to a 2.5 version as I understand , from keith tannars book, it gives a small power boost to a normally aspirated car and was wondering if the 2.5 manifold and down pipe are a straight swap to the mk2 head and mk2 centre section . I don't wish to change the centre section as its a quality s/s system . Thanks in advance Brian ]96 na Merlot edition. sold 99 nb 10th anniversary 93 na s ltd Merlot man ** Posts: 940 Joined: Wed, 02 Jun 2010 8:16 +0000 Location: Co Clare,Ireland Top Re: 2.5 manifold onto a mk2 by Real Rayzor » Wed, 11 May 2016 4:04 +0000 I happened across this today on nutz Brian. I think it should answer your question. http://www.mx5nutz.com/forum/index.php? ... getnewpost 2002 MK2.5 Sunlight Silver (sold) 1992 MK1 V-Spec. Brilliant Black, Fully Restored Real Rayzor Posts: 700 Joined: Fri, 15 Aug 2014 10:38 +0000 Top Re: 2.5 manifold onto a mk2 by davith501 » Wed, 11 May 2016 4:34 +0000 2.5 manifold is better quality and has better flow compared to mk2 and is a direct swap to the block. Unfortunately, as far as I remember, downpipe and mid sections are different. Mk2.5 has cat on the downpipe +mid section with silencer and mk2 has downpipe +mid section with cat and silencer. Different lengths and angles would require cutting and joining if you want to keep your existing mid section. Possible but some fiddling required.. Don't think that is what you're after.. Icon RS Mk1 davith501 Posts: 626 Joined: Thu, 29 Nov 2012 9:31 +0000 Top Re: 2.5 manifold onto a mk2 by Merlot man » Wed, 11 May 2016 5:10 +0000 Thanks gents that's what I thought myself . Anyone after a quality s/s mk2 mid section with cat and silencer ! Brian ]96 na Merlot edition. sold 99 nb 10th anniversary 93 na s ltd Merlot man Posts: 940 Joined: Wed, 02 Jun 2010 8:16 +0000 Location: Co Clare,Ireland Top Re: 2.5 manifold onto a mk2 by MX5Spares » Wed, 11 May 2016 5:13 +0000 Hi Brian ,they will not swop without centre section ,as above. MX5Spares * Posts: 2303 Joined: Wed, 22 Sep 2010 4:59 +0000 Location: dublin, Top Re: 2.5 manifold onto a mk2 by Billium94 » Wed, 11 May 2016 11:34 +0000 Hi Brian, I might actually be interested in that mid section if you do decide to get rid of it! I've a hole starting to come in my own one! Bill Billium94 Posts: 63 Joined: Thu, 30 Jul 2015 1:17 +0000 Top Re: 2.5 manifold onto a mk2 by MX5Spares » Thu, 12 May 2016 4:55 +0000 Hi Brian, we have the front manifold section ,with cat ,and mid section but not stainless only standard mild steel. MX5Spares *** Posts: 2303 Joined: Wed, 22 Sep 2010 4:59 +0000 Location: dublin, Top Re: 2.5 manifold onto a mk2 by Merlot man » Thu, 12 May 2016 10:51 +0000 Thanks Robert , if I was going to go for this idea it would you I'd be talking to , if you ever get these in S/S please let me know . Bill thanks for the interest but i'll keep what I have for now , my advice is to talk to Robert , I'm sure he has some standard ones ; it would be cheaper and easier than a repair , I got this S/S item from him so worth a phone call ! Thanks to everyone for their posts and advice Brian ]96 na Merlot edition. sold 99 nb 10th anniversary 93 na s ltd Merlot man Posts: 940 Joined: Wed, 02 Jun 2010 8:16 +0000 Location: Co Clare,Ireland Top Re: 2.5 manifold onto a mk2 by Billium94 » Thu, 12 May 2016 11:43 +0000 My own one is fine for now Brian, I'd only really change it if I could get a S/S one but I'm in no rush with it! Thanks, Bill Billium94 Posts: 63 Joined: Thu, 30 Jul 2015 1:17 +0000 Top


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