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Matching exhaust manifold, worth it?



len_beach

ClioSport Club Member
  E92 M3,172 track car
I'm currently contemplating a bargain 182 manifold.
Now with all the talk about inlet manifold matching, how much of a gain would I see if I matched the exhaust manifold to the gasket?
Obvioulsy it wouldn't be anywhere near the gains seen on the inlet side but is it worth my effort/cash?
 
  cup 182 mit stripes
Not a ha'purth of difference and a lot of hassle to take off/put on. Surely you must have known that. From previous posts you appeared clued up.
 

len_beach

ClioSport Club Member
  E92 M3,172 track car
Not a ha'purth of difference and a lot of hassle to take off/put on. Surely you must have known that. From previous posts you appeared clued up.

I'm clued up on what I have researched/already know from experience. In theory, this would be a worthwhile mod' 'somewhere' along the scale but where is the question?
The manifold will already be off as I have a 172 but plan on fitting a 182 manifold. While it is being fitted I thought the match may be worth while.
I have seen a Mark Fish car advertised as having this done but as I said I knew I wouldn't reap the same gains as the inlet side but thought it may be a nice cheap/easy addition.
 
  Lionel Richie
the insides of the pipes where they meet the manifold flange need cleaning up, apart from than no need to touch it
 

len_beach

ClioSport Club Member
  E92 M3,172 track car
the insides of the pipes where they meet the manifold flange need cleaning up, apart from than no need to touch it
When you say inside Fred, do you mean the internal bore of the pipework and not the mating face. And cleaning up is just that and not hardcore material removal?

Cheers Federico.

P.S. A mate said he was going to get in touch about an ITG panel filter (DonnyDog), did you get his PM?
 
  Lionel Richie
where the pipes have been welded onto the flange, inside needs welding up and dressing, not 100% neccesary though
 
there is zero need to touch anything.

The new clios have ports which are 40% smaller than the older ports of which the manifold flanges are based on, so matching the ex ports is a wasted exercise.

And even on older large port heads, the flange is larger than the port area, and the pipe diamter even larger still. No point making something that is too big already, even bigger........thats far to american an exercise.
 

len_beach

ClioSport Club Member
  E92 M3,172 track car
Cheers fellas. I'll scrap that idea then. I thought it sounded a little far fetched when I saw it on an advertised car.
 


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