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Exhaust manifold
Posted: Tue Mar 19, 2019 7:10 pm
by Colin118
Hi there, I am planning on buying a Lexmaul exhaust manifold designed for a Vectra A which is sold in Germany. I am wondering if anyone has bought or fitted these to a Cavalier before ? - Mine is a SRI 2.0 16v Ecotec
Below is the website and information
Many thanks Colin
https://www.lexmaul-shop.de/Manufacture ... ::551.html
Re: Exhaust manifold
Posted: Thu Mar 21, 2019 8:44 pm
by iangsi
It's listed to fit so shouldn't be a problem, but I'd contact them first just to be sure. I fitted a Janspeed manifold to my old GSI with a C20XE in it years ago with no problems. James is deliberating buying a stainless one for one of his fleet from Germany not sure if he's done it yet or not, see supplier ebay user name www*gm-carsolution*de
Re: Exhaust manifold
Posted: Fri Mar 22, 2019 6:00 am
by ilovedmymantas
That's a lot of dosh to pay for a branded manifold.
I considered buying one for my eco after seeing James' post
viewtopic.php?f=83&t=16593
The one you're after is here
https://www.ebay.co.uk/itm/Header-Stain ... 2254637186
It's a similar 4-1, a third of the price and shiny
As Ian suggests, contact companies first.
I'd query the 'not fit for egr' bit in particular
My last car was an eco sri, so I envy your close ratio gearbox - my cdx has wide
Re: Exhaust manifold
Posted: Sun Mar 24, 2019 12:17 am
by Robsey
Agreed about the "a lot of dosh" comment, especially as you will probably see between 5 and 7 hp increase at the very most.
So just under €100 per extra horse.
I have read many articles, and it is all to do with air flow, so many punters mention bigger exhaust valve heads, and porting to smooth the passage of exhaust gasses out of the engine and out through the exhaust.
And a decat pipe to reduce flow restriction.
(Except at MOT time of course)
In all honesty - I have found the best improvements (hp per £) by carrying out a "Redex and Italian Tune Up" procedure.
It definitely transformed my car massively.
Re: Exhaust manifold
Posted: Mon Mar 25, 2019 11:32 pm
by ilovedmymantas
Robsey wrote:….
In all honesty - I have found the best improvements (hp per £) by carrying out a "Redex and Italian Tune Up" procedure.
It definitely transformed my car massively.
Redex always worked well for me too, the difference is noticeable
I now mainly use shell nitro+ (same results) because I got fed up faffing about adding it to the tank, and It's not often I can fill-up.
It works out about a fiver a tank more but even if I can't fill it, the mix is always the same, so for now It's worthwhile. That may change when fuel prices jump but for now, I'm trying to keep the car ethanol - free.
I got distracted by 'the shiny' and forgot to add a link I had saved a while ago when I was looking for manifolds
https://www.ebay.co.uk/itm/VAUXHALL-AST ... 2198270250
May be worth enquiring?
matt