Manifold/Exhaust System for a 1.4 Westcoast

[adamsax]

Just after some idea's. The next big thing for my car is a full new exhaust system as it is standard at the moment and a MASSIVE let down on the car.

I'm pretty sure I want a De-catted Magnex system, but what about manifold?

Any suggestions?

Am I right in thinking 4-2-1 is better for acceleration and 4-1 is better for top-end?

Anyone suggest and good makes, and maybe a link to the correct fitment for my car?

Would an aftermarket manifold from a VTR (cat under car) fit on a Westie?

Cheers in advance.

:Y:

[Colin]

You could look at the ABP magnex single box system. De-catted would sound ace.

Yes, 4-2-1 better low end power, loose abit top end. 4-1 more top end, loose some bottom end.

Or a De-catted Scorpion system. Slightly louder than magnex.

Look at them Raceland 4-2-1. Pretty good I hear. You will get a nicer tone with a Manifold too.
There on Ebay.

GMC do 4-1 and they list the 1.4

[adamsax]

I was just looking at that manifold Col.........

http://www.gsmotorsport.com/gmc-41-manifold-p-348.html

Would I need a lamda sleeve or any other extra's or would this just bolt on?

If I do need anything, can someone point me in the right direction?

Ta.

[Colin]

I don't think you need a sleeve. Cat on Manifold only because they have 2 lambdas (i think)

And it bolts straight on no probs. At least it should!

You may actually want 2 boxes in your system because one may make it run like a bag 'o' shite! Back pressures, sound pressure waves etc.

[saxoash]

get the raceland its only £140 and goes a lush gold colour when warm landys got one and it was straight fit

[Sean]

not sure if the raceland is proper tuned length, which the gmc one is. also the gmc is a 4-1 which improves top end, and is better for the 8valves as they have decent low end torque and struggle top end.

[saxoash]

not sure if the raceland is proper tuned length, which the gmc one is. also the gmc is a 4-1 which improves top end, and is better for the 8valves as they have decent low end torque and struggle top end.

Id have the low down torque over top end, someone has compared a ranceland to a gmc on ssc and the raceland gave better results, this was on a vts tho and this was on a rolling road.

Even if there not properly tuned lengths there still a hell of a lot better than the standard manifold.

[Sean]

Id have the low down torque over top end, someone has compared a ranceland to a gmc on ssc and the raceland gave better results, this was on a vts tho and this was on a rolling road.

Even if there not properly tuned lengths there still a hell of a lot better than the standard manifold.

iirc didn't john from gmc pull those results apart and more or less prove them to be bollocks? ie how you can you compare 2 products which aren't even the same? and if i also remember correctly they weren't run on the same r/road and even on the same car? there has also been stories of the raceland being a poor fit and of it cracking. agree completely that the standard manifold is crap though and very restrictive :)

[saxoash]

iirc didn't john from gmc pull those results apart and more or less prove them to be bollocks? ie how you can you compare 2 products which aren't even the same? and if i also remember correctly they weren't run on the same r/road and even on the same car? there has also been stories of the raceland being a poor fit and of it cracking. agree completely that the standard manifold is crap though and very restrictive :)

It was tested on the same car and the same rr, the car was maped with the gmc one on and got 166bhp and 124lbt, the raceland got 166bhp and 126lbt unmapped probs just down to the ranceland being 4-2-1. all stainless steel manifolds are prone to cracking not just the raceland :thumbup: agree with the fit tho, a few have been know to be a shit fit

[Sean]

It was tested on the same car and the same rr, the car was maped with the gmc one on and got 166bhp and 124lbt, the raceland got 166bhp and 126lbt unmapped probs just down to the ranceland being 4-2-1. all stainless steel manifolds are prone to cracking not just the raceland :thumbup: agree with the fit tho, a few have been know to be a shit fit

but the car had different cams fitted on the two different r/road runs ;) so it's impossible to tell the gains from the manifold alone :)
and if the runs weren't carried out on the same day then it isn't a fair test ie could've been warmer or cooler on one of the two days, r/road might not have been calibrated etc etc. look at the two graphs, then read what john from gmc says about them ;) also as gmc manifolds are made by btb then you know they're tuned specifically for the saxo (we've all heard about the btb full system). also the gmc is mild steel whereas the raceland is stainless which is more prone to cracking under heat. at the end of the day it's all about personal choice and what you can afford, if you feel the difference in a 4-2-1 :thumbup: but personally i'd keep my money until i could afford the gmc one. :)

[adamsax]

Cheers boys, think I'm gonna go for a GMC 4-1 w/ Magnex system.

About these boxes though, if I brought a de-catted system would it come with a silencer box? Is there one already under the car?

I'm just worried about Col saying it will run like shit with no boxes/cat?

Ta.

[saxoash]

ahh yeah sorry, he got 162bhp @ 7500rpm & 121lb ft torque @ 5500rpm after remaping with the gmc and 166.6bhp @ 7500rpm and peak torque is 126lb ft @ 6000rpm with the racland both runs with the following mods:
Engine spec:
40mm Jenvey TB's
Skimmed head (13 thou)
708 Cat cams
Pug sport Group N exhaust
Emerald management
yeah its alabout what you can afford but, i still think the raceland is a nice bit of kit you got to give the newbies a change to prove them selfs as GMC have bene proven :Y:

[Colin]

The centre box is there for a reason. To keep pressure waves and back pressure intact.
But de-catting would make it noisy too.

The only reason why people do away with it is to make it louder. If you did do away with, like Rally Cars have, its best to have it set up.

[Sean]

yup ash completely agree, and if i was still a student bum then £150 for a manifold isn't to be sniffed at ;)

adam- the magnex system is cat-back, so to make it a 'proper' full system you add a decat pipe which is just a straight through pipe, no box. with a 1.4 it will lose power without the boxes, after all they're there for a reason. :)

[adamsax]

adam- the magnex system is cat-back, so to make it a 'proper' full system you add a decat pipe which is just a straight through pipe, no box. with a 1.4 it will lose power without the boxes, after all they're there for a reason. :)

So I'd loose power by De-catting it?

Fcuk it, ball ache with MOT's anyway. It's only a 1400 at the end of the day, I'll save all this fancy shit for my VTS.

I'll just go CAT-BACK.

Cheers.

[Dan]

I'd always go for Gmc or supersprint for a manifold.

[hesslevtr]

gmc all the way well worth the money never had 1 problem fitting mine

well worth every penny