dave_t

iTrader: (1)

Ok chaps what would you do

Have a pretty stock newage WRX (back box/filter) & looking to get the car running nicely with a remap shortly. I'm not into chasing figures, nor looking to mod any further.

1. I am unsure whether to go Dynamix or Andy Carr (as duel maps).

2. I think i am correct in expecting around 260 with the stock exhaust, upto around 280-290 with a full decat.

So, realistically a full decat is not exactly a cheap addition (£/bhp) but is it worth it? I have heard that the cars torque is notably improved, even though bhp is only up by a small(ish) percentage.

The other issue has to be MOT, i'm based in Chepstow & know no friendly stations (please PM suggestions, should i decat).

Also decat/sports catted downpipes, do they pass MOT's?

I guess some of you will have experience between catted/decatted so let me know your thoughts!

Also, if i get Duncan or Andy to Chepstow over the next few weeks is anyone looking for a map session?

Cheers all

Dave

KJD Mk1

iTrader: (3)

You can expect around 260 - 280 with a de-cat no more thatn that as your turbo is your restricting factor.
Don't let the figures influence you with a remap with or without a de-cat the car will be hugely improved in the drivability area with just a remap alone.
Having a De-cat is a pain at MOT time if its a road you want to go down I'd opt for a sports cat so you get the best of both worlds.

mervil

iTrader: (5)

Best thing for your car...

Fuel pump £80
550 injectors £100ish
K&N Panel filter £50
VF34 Turbo £250-300
Sports catted exhaust £???
Remap...

should see c320bhp

Fleetster

I went for

Decat
Exaust already fitted
Fuel pump
Pipercross panel filter
Remap - with pops and bangs by Andy Carr

have to say I am over the moon with the difference

The Trooper 1815

iTrader: (31)

On my newage Wagon I changed/fitted:-

New Uprated Fuel Pump.
Decat down pipe.
Good panel filter.
STI Topmount.
Good exhaust system.

I saw 276bhp/280PS that transformed the "driveability" of the car. If you want to go further and get the power down then better shocks, spring, brakes, tyres, geometry etc will make it even better.

At 270 + your beginning to add strain to the clutch and gearbox. As a precaution you may consider replacing the clutch not long after any remap, but that depends on how old the current one is.

Or buy an STi

eifion

just put mine in for mot this week, its fully de cat and failed, so got to find another exhaust, hope it doesnt change the performance too much, u have to have a cat fitted to any car from 2001 onwards, i think but stand to b corrected on that one, hope this helps

Rescue Dude

iTrader: (11)

The rules state that if a car was fitted with a cat when it left the factory it MUST have one for the MoT regardless of the age of the vehicle.

dave_t

iTrader: (1)

MOT is a real bug bear (and well talked about).

1. Full decats are obvious fails as emissions will fail.

2. Sports cats or even a single cat removal 'should' be a fail also even it passes emissions! All cats must be in place 'i.e. as it left the factory'. Replacement cats must be kite mark approved.

So weirdly:
a: if you have a dpipe sports cat & normal second you will pass emissions but could fail due to sports cat fitted
b: if you have a normal dpipe cat & decat second you will pass emissions but could fail due to a cat missing
c: if you have a normal dpipe cat & 'take the guts out of the second cat' you will pass emissions and all your cats are present

The Trooper 1815

iTrader: (31)

Buy an import.

dave_t

iTrader: (1)

doh! hindsight lol

The Stitcher

iTrader: (12)

Get a prodrive sports cat and exhaust , fuel pump and sti cooler and get it mapped and should pass mot no problem

Rescue Dude

iTrader: (11)

An import still has to have a cat.

dave_t

iTrader: (1)

So, prodrive sports cat, loose the centre cat and connect to my existing cat back yeh?

dave_t

iTrader: (1)

right chaps, firstly thanks for all your input.

I have to toss up between either keeping system standard (besides a cat back) or a PPP sports cat down and a decat up-pipe. I have sellers lined up for both.

So to help me decide:
approx fitting cost for an uppipe & downpipe?
approx fitting cost for just the downpipe?

Suggested garages Gwent/Cardiff etc....

mervil

iTrader: (5)

Three Arches in CF14 in Cardiff... won't go wrong with getting Dean and the gang to fit them !

dave_t

iTrader: (1)

Hopefully this will be the last question & i will finally be able to make an informed decision.

If i fully decat it will fail on emissions.
Refitting the 'centre cat only' (4 easily accessible bolts) emissions will pass (even though i have a decated downpipe)?

i.e. as Scoobyworlds package that actually leaves the centre cat in place.

Assuming above is correct the choices are:
1. Leave all cats in place, live with a cat back & remap
2. Remove the centre cat (MOT friendly as downpipe cat in place), get the same effect by gutting its internals & refitting?
3. Remove the centre cat & use a PPP downpipe (MOT friendly)
4. Decat the downpipe and leave the centre cat intact (MOT friendly?)
5. Say bugger it, decat the lot and come MOT refit the centre cat only.

Sorry for my persistence with this.

The Stitcher

iTrader: (12)

Don't think it would pass the mot with just a center cat in place , would only pass with the main cat or sports cat in place and center gone ,

dave_t

iTrader: (1)

Hmmm, weird and as you can imagine puts a whole new throw on it if all you have to do come MOT is replace the centre cat (easy 4 bolts & done or a few beers for the local fitter rather than a downpipe replace)??????

From Scoobyworld:
We leave the factory 'catpipe' in place, and instead replace the original restrictive downpipe with our de-cat downpipe - this produces around 265 bhp (this setup has been tested on our UK car and passed the required MOT emissions tests well within the required limits)

See http://www.scoobyworld.co.uk/catalog...oducts_id=1504

The Trooper 1815

iTrader: (31)

Dave,

I removed my 2002 cat up pipe, removed the resonator and it passed the MOT.

PhilWrx100

On my 2005Wrx, I removed the Wrx uppipe to a sti decat, downpipe to a ppp prodrive sports cat and removed centre cat to a prodrive one(original shield still on) so pipe looks like a catted one
Cost to fit was 170 quid from local garage.
Fitted a walbro fuel pump, 3 port solonoid valve and filter panel. Result after mapping
287bhp and 285 ft lb of torque. Worth every penny Racedynamix did mapping
oh and the emission pass easily even with just a sports cat it place.

The Stitcher

iTrader: (12)

Is that the up pipe before turbo ? as that won't make a difference in mot it's the cats after which is one big cat (downpipe ) then just after is the second one middle section of exhaust

There are three cats on a Newage
See link below
http://www.scoobypedia.co.uk/index.p...e/DecatExhaust

dave_t

iTrader: (1)

I'm quite confused here as Scoobyworld clearly state that a decat 'with a standard centre cat' will pass MOT.

I will repost this query in the main section to see if i get some more feedback.
The result will dictate what i do...

Thanks to all that have contributed so far

PhilWrx100

I know it can be confusing Dave, but the long and short of it is that if you run full decat it won't pass end of. But if you have only one sports cat it should. I clearly stated this at the MOT i only had one. The garage didn't mind at all. Its all about emissions not the number in place so I'm told. This is why the Scoobyworld kit works as well.
So you need to think what you want out of the car and costing of it all. Cause its not a cheap job upgrading properly and safely. For everything i paid a grand all in (see above post for details) Even if you just remap as is, you Will get a good improvement. I just wanted the most out of the standard td04 as it pulls so great at low revs. your call......
Phil

The Trooper 1815

iTrader: (31)

Yes Lee, but it still helped it to get 276bhp

dave_t

iTrader: (1)

Just for reference guys and some feedback for all that joined in this thread.

I chose to loose the centre cat, but left the up-pipe/downpipe totally standard as it was cheaper/MOT friendly.

The car also has a filter and Milltek cat back.

After Racedynamics had done the business she gave a healthy 281bhp/291torques with a fab smooth curve (R/Road figures)

The Stitcher

iTrader: (12)

That's a good result for standard cat, did you have an up rated pump ? Bet your over the moon with that as I would be for sure well done