yet another 'what 4-2-1 manifold do I get?' thread - help please!

[hudson701]

OK, I've been reading all the recent threads on 4-2-1 manifolds which has left me confused tbh as they all seem to give conflicting information. From what I gather these are the major producers of 4-2-1 mannis:

Raceland - cheap, with poor build quality. likely to blow a hole/not last very long. However, very popular.

Supersprint - expensive, excellent build quality.

Milltek - not much info.

Janspeed - expensive, sometimes poor build quality/welds. Other than that, not much info.

GMC - haven't found much on this manni.

I have a mk2 vts with a powerflow backbox system - what 4-2-1 manifold should I get? Are Raceland as bad as the majority seem to make out?

Also, to fit the manifold, will i have to remove anything from the existing setup, and will the car pass it's mot? Will I need a new centre section?

Help here, not sure what I need. I'm fairly competent with spanners so will most likely fit it myself.

Cheers TIA

[makaveli144]

Also, to fit the manifold, will i have to remove anything from the existing setup, and will the car pass it's mot? Will I need a new centre section?

VTS cats are always under the car so will pass mot no problem.

I have a raceland on my VTR and it has being fine, doesnt blow and made the car more raspy and a lot more responsive. In the way of gains they are all very very similar so that shouldnt really affect your decision.

[hudson701]

VTS cats are always under the car so will pass mot no problem.

I have a raceland on my VTR and it has being fine, doesnt blow and made the car more raspy and a lot more responsive. In the way of gains they are all very very similar so that shouldnt really affect your decision.


So basically its a straight fitment of the 4-2-1 mannifold? no removing any of the undersection, or moving any other bits? Sounds too good to be true...

[williamsvts]

GMC no questions asked imo.

[Matty-VTR]

GMC no questions asked imo.

Based on what? More power over the others?

[williamsvts]

better build quility and better designed imo, just an overall better manifold.

[paddy88]

what kind of power gains do u expext to get with a manifold? 10 bhp?

[paddy88]

anyone?

[makaveli144]

So basically its a straight fitment of the 4-2-1 mannifold? no removing any of the undersection, or moving any other bits? Sounds too good to be true...

Basically yes, not sure but you may have to move the oil filter though.

I think 10bhp optimistic, probably about 7.

[hudson701]

GMC no questions asked imo.

And where can i get one from?

Echo the question above, is there really much of a performance gain or is it just noise?

[makaveli144]

hudson you would need to contact GMC, GMC manifold is 4-1 not 421 and it is all explained here http://www.gmcmotorsport.co.uk/index.php?main_page=page&id=30

[Furio_Rob]

GMC only do 4-1 iirc

i have the same dilema atm

raceland for about £150-200
or supersprint for abour £300

think ill just go with raceland tbh, the difference cant be much and if you have it fitted profesionally should be ok :y:

[hudson701]

hudson you would need to contact GMC, GMC manifold is 4-1 not 421 and it is all explained here http://www.gmcmotorsport.co.uk/index.php?main_page=page&id=30

Well 4-1's are for high end gains correct? And 4-2-1 are for all through the range gains, perhaps better gains low down. For this reason I think they might be better suited to the vts power delivery.

[Yates]

4-1 better suited to vts imo

higher up revs for 4-1, vts kicks in higher up the rev range also

suited

i have 4-1 gmc

[KamRacing]

Well 4-1's are for high end gains correct? And 4-2-1 are for all through the range gains, perhaps better gains low down. For this reason I think they might be better suited to the vts power delivery.

You can't use such a simplified rule.. the raceland gets gains at low revs, medium and top end..

[yorkie]

i have ashley 4-2-1 mild steel manifold it seems to do the trick

[Yates]

yorkie you have vtr

[leeroybrown]

This is how I have always seen it

4-2-1 works good on a VTR

4-1 I still I think is best suited to a VTS

Between me and 2 other mates we have had pretty much had every manifold and all stand by the GMC as being the best.

[b0t13]

i got the raceland 4-2-1 and im happy with it, good power cheap and quality isnt that bad tbh.

[hudson701]

mmmm....tempted by a 4-1 now going by what people have said. Is there much of price difference between a 4-1 and a 4-2-1? What about fitment, any issues there?

[andy-vtr]

get a piper 4 - 1 there spot on ;) both me and my mate have them.

[andy-vtr]

all in all get what you thinks best, mines cammed and revs well top end with a 4-1 ;)

[hudson701]

do piper do 4-1's for a mk2 vts?

[JamesR]

yeah piper do 4-1's for a mk2 vts, u have to giv em a call though.

[KamRacing]

yeah piper do 4-1's for a mk2 vts, u have to giv em a call though.

we sell most of the manifolds in the list above.

Don't quite agree with the summary in the first post though.

For piper etc
http://www.kamracing.co.uk/citroen-saxo-1/exhaust-20/manifold-38/

Certainly regarding the build quality of the raceland they aren't as easy to fit and the finishing is sometime a little rough but none that we've sold have fallen apart. They come with a guarantee for a few years too.

[hudson701]

Don't quite agree with the summary in the first post though.


OK, then please correct me. What is your view of the manifolds?

I'm looking for a new manifold to give the best possible 0 - 60/80mph performance, rather than top end gains. Reason being is that in everyday driving you're not going to be doing 100+mph, so modifications which only show a real benefit at these types of higher speeds are wasted IMO (on the road, anyway).

As I said earlier, advice is welcome.