[Dorchester]

As the title tells I'm looking for a derestricted (or free flow) exhaust line for my 214i cabby.
Why?
First I'd bought for my 75 V6 2.5 from MIJ Exhaust a full SS exhaust line for a very decent price and I'm very pleased with it since several years.

Then as I've modified the air box in the cabby as well to admit more air and help breathing the engine a little better, it looks essential that the exhaust line be part of the plan.
At last I'm keen to get an SS exhaust line lasting for years and not be bored by rust any longer.
What do you think? Was anybody tempted say for his 220 coupé for example?
Or would you think that swapping only the back box might be enough to ease the gasses?
Are there any sellers used to make uprated exhausts for the cabriolet / coupés 200 series in Britain?
Thank you for your advice or experience.

[220 GSi turbo]

Almost 20 years ago I bought an uprated stainless system from Moto-Build for my 220 Turbo and several years before that I bought a stainless system from them for my MG Maestro EFi.

They are still in business now: https://www.moto-build.com/ and although they do not appear to have anything specific to the 214 listed on their website, they would be a good source of advice

[Dorchester]

Thank you for that. I'll try to call and ask very soon.
As they say if you don't ask you don't get...

[Dorchester]

But BTW would you think that swapping only the back box might be enough to ease the gasses and then if so which back box to fit?

[961tat]

At the end of the day there no substitute for CC but the exhaust manifold on the rover is terrible the inside is restricted with weld and is shameful , I Tig welded the outside ( if you don't do this the flange will fall off ) and ground out the welds on the inside to match ports on head which as also been gas flowed , I would have a word with moto-build as Mr 220 recommends but stay away from big bore system they just make noise for the road and you lose power low down .
Before and after exhaust port pictures attached

https://ibb.co/QnjtgDh
https://ibb.co/LnrTdrg
https://ibb.co/khhzMBp

[Dorchester]

Thanks but what do you mean by "CC" Chris? Sorry to be a bit dummy... Coupé Cabriolet maybe?
Congrats for your fine job! But why on earth a so badly designed exhaust manifold? It looks as being done by a scullion...
Anyway there's surely more after the exhaust manifold to slow down gasses: what would you recommand to swap up to the tail?
And talking about big bore system which should I run away from?
Thanks.
EDIT: what I intend to do isn't properly upgrading or tuning, I don't mind. It has to do with full E85 (ethanol) because needing more fuel (20% more than E5) you need as well evacuate better the gasses hence a free flow exhaust as I did with fine results on my KV6.

[961tat]

Thanks but what do you mean by "CC" Chris? Sorry to be a bit dummy... Coupé Cabriolet maybe?
Congrats for your fine job! But why on earth a so badly designed exhaust manifold? It looks as being done by a scullion...
Anyway there's surely more after the exhaust manifold to slow down gasses: what would you recommand to swap up to the tail?
And talking about big bore system which should I run away from?
Thanks.
EDIT: what I intend to do isn't properly upgrading or tuning, I don't mind. It has to do with full E85 (ethanol) because needing more fuel (20% more than E5) you need as well evacuate better the gasses hence a free flow exhaust as I did with fine results on my KV6.

Sorry should have explained better CC = Cubic capacity .
As far as big bore going I wouldn't use any and the back box us a good idea depending on what you have one already my 1.4 had pea shooter fitted by previous owner and runs great with a 1.6 system on .

I converted a fellow cabby owner with honda 1.6 in to go back to standard after he had a go in mine , he had a big bore system one and it was awful low down plus the drone driving down the road hes also going back the standard airbox instead of open cone .

My air box is a diesel bottom end modify with rover 45 top so you can fit in bigger air filter works well .

A zr 160 airbox is a good upgrade to if you can fine one.

[Dorchester]

I've put years ago a 1.8 VVC twin tails back box (diam. 2.5") on my 25 pipe (diam. 2.25") and it runs nicely plus a nice and discreet croaky gurgling.
Regarding the air box I've drilled 7 holes with the circular saw at the bottom and put a K&N filter. It looks efficient.