Matt Churchill

Currently running a Scoobysport back box on UK MY99, and I'm thinking of uprating a bit more of the exhaust system.

Funds being tight, it's one bit at a time. Anyone got any advice on whether to change mid section, or down pipe next. Also, will either on their own contravene MOT requirements?

Matt

Sith

I have been told that the next thing to do would be DP. Several people have said this. This will lose the Cat in the DP. But if you leave the centre section alone then you *may* pass the MOT.

The centre section will give an increase in performance, but the major thing is the DP.

Don't forget the noise issue of going catless or without resonator. The noise seems to vary depending on exhaust system and Model Year of the car.

I *think* from what I've read that early years make more noise with the same system than later years.

Hope this helps. As I've recently asked a similar question.

P.

CraigH

Definitely DP.

Is very noticeable - centre section helps, but nowhere near as much.

MARK MORRIS

hi
i changed the centre pipe for a ss after a ss back box, i am going to put the ss downpipe on in feb after i have mot'd it
mark

GaryC

Downpipe for biggest gains, but the centre section is cheaper, will still leave car road legal (ie pass MOT), and still give noticable gains!

Alternatively do both

MDavenport

I am currently looking into this very same thing but I want to still stay road legal (i.e. MOT emissions).

I have been told by a lot of people that the SS downpipe is great, but it is very hit and miss with mot having just a standard centre section cat.

I think (as soon as funds permit), that I am going to go for the Power Engineering T75 system. This comprises of a downpipe without CAT and a centre section with a CAT (that will pass emission tests). This will also bolt onto a scooby sport back box no problem.

If anyone disagree's or know's of a better alternative then please reply as I also want the best options..

Mark.

Clarkey

I got the centre section and downpipe second hand, so didn't have any choice!

I've got a blitz induction kit as well which I may not keep due to the noise, and don't have any catalysts, although re-fitting of the centre section shouldn't be too big a job come MOT time.

There are many stories about the accuracy of figures at PE, but my was showing about 230 to 235 before (S/S backbox only), so it's certainly a healthy relative increase, regardless of whether you believe the absolute figures.

Far more impressive is the torque delivery though - it has completely changed the character of the engine.

Dazzler

Did you get ear muffs thrown in for free with the exhaust Steve ?

Matt Churchill

Thanks for all the input guys.

I'm with you Mark, ideally I want to stay road legal, without needing to change exhaust bits before an MOT - I'm just too lazy!!!

Matt

JDS

I went this route on my MY99

SS Backbox
SS Downpipe
SS Centre section

Sounds lovely and noticeable performance gains. More torque and pulls hard all the way to the limiter.

I felt the biggest performance gain was from the downpipe

Be careful with the noise though. Try and find someone nearby so you can have a listen. Some people won't like the noise. Personally I love it

With regard to MOTs, you will hear varying reports as to cars that will pass with two cats, one cat and even no cats (if hot enough!!) but generally it is down to the individual car (and where you get it tested ).

However, changing the centre section is a fifteen minute job. Not too much to ask once a year for the lurvely sounds IMHO.

James

AndrewC

I am about to make a similar choice and was all set to purchase a SS D/P, either new or preferably s/h, as I have a SS BB. However, having looked at the dyno results the T75 DP seems to give a reasonable power increase as well as the improved driveability where as the SS DP seems to be mainly driveability.

My questions are:

Is it the general concensus that twin dump DPs give a distinct power advantage over the single 'fat pipe' designs?

Does anyone have any experience of the ScoobyMania exhaust system as the combined cost of the DP and Center is about the same as the ScoobySport and quite a bit less that the PE?

AndrewC...

[This message has been edited by AndrewC (edited 08 December 2000).]

Clarkey

I've just fitted a Scoobysport downpipe and Magnex centre section to my MY99 that already had a Scoobysport backbox, and the results are impressive.

The dyno at Power Engineering showed peak power of 260bhp at 6100rpm, and peak torque of 247lbs/ft at 2600rpm, pretty much flat all the way to 6000rpm. On the road the results are even more impressive than the figures.

I would go for the downpipe initially. It will make the turbo spin far earlier, and enable to car to pull throughout the rev range. It should also pass an MOT.

Matt Churchill

Steve,

How much was the Magnex section? Are you running any other upgrades, as power figures sound pretty good.

I'm getting 229bhp at 6220rpm and 216lb/ft at 4880 rpm from a SS bb, so 260bhp sounds good.

Also, the PE T75 system sounds good, but is sooo expensive.

Why the Magnex and not the SS, has the Magnex got a cat?

Matt

[This message has been edited by Matt Churchill (edited 08 December 2000).]

[This message has been edited by Matt Churchill (edited 08 December 2000).]

Clarkey

Sod off Dazz, you'll be next.

(Dazzler works with me, and I'm sure will agree that the change is impressive.....if loud)

[This message has been edited by Clarkey (edited 08 December 2000).]

Dave T-S

Full SS system, all fitted together, loud (set off the alarm on the same VW Passat for the second day running in the station car park this morning ).

I like it loud, but try before you buy, if you can. On MY00 car makes big difference to performance.

Dazzler

Steve,

It does sound pretty darn good. Definitely pulls a hell of a lot more freely as well.

Put a smile on my face anyway.

Matt Churchill

The next thing is which one? I'm inclined to go for SS, but has anyone got any advice/idea whether this is the best one?

Also, anyone know if the PPP mid section is de-catted?

Anyone want to donate any parts, they'll be gratefully received

Cheers,

Matt

GaryC

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by Matt Churchill:
<B>The next thing is which one? I'm inclined to go for SS, but has anyone got any advice/idea whether this is the best one?

Also, anyone know if the PPP mid section is de-catted?
[/quote]

SS is as good as any

PPP mid section is de-catted, just has two baffles/silencers

Matt Churchill

Gary,

sorry to seem stupid, does that mean that the SS and the PPP are then same internally?

Matt

HAPPY

matt

you have mail

pete

GaryC

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by Matt Churchill:
<B>Gary,

sorry to seem stupid, does that mean that the SS and the PPP are then same internally?

Matt[/quote]

No they arm't the same.

The PPP centre section is the same as the STI centre section, being non-cat but with two baffles.

IIRC - SS do two, one is a straight through pipe, one is just the standard UK centre section with the cat removed.

The straight through one will be the 'best'. As for which to go for - a straight through stainless steel pipe can only be done so many ways!!

dowser

My PPP midsection (same as STi?) is straight through - ie; I can see light through it!

The baffles appear to be some form of resonator (perforated tube) which I guess is an attempt to remove any "boominess".

Richard

dowser

In theory, yes

I'd love to hear from someone who's "been-there/done-that" though! Anyone?

Matt Churchill

Thanks for all of the info guys, I'm even more confused now

Anybody know if the Power Engineering set up (T75) is the only MOT legal way to improve the DP and centre section? How does it compare with the PPP, and does the PPP include DP and centre?

Thanks again

Matt

[This message has been edited by Matt Churchill (edited 12 December 2000).]

dowser

The PPP comes with the decatted centre and the backbox. The OE downpipe is left as is, so you've still got the cat there.

If you want to keep a cat I think BPM also do a hi-flow catted centre similar to PE's d/p one. Or why not have a high-flow sports cat fitted to your current centre and fit a new d/p?

Richard

[This message has been edited by dowser (edited 12 December 2000).]

Matt Churchill

Cheers Richard, any idea on where to get sports cats from ?

Would a catted mid section be enought topass MOT though with de-catted DP