Exhaust help

[stfc_gti]

I need to clear something up. I have decided to put a new exhaust on my mk 4 1.8t golf and have been speaking to amachanic friend of mind and he has given me some info and has spoke to me about a full cat back system and a de-cat  etc,

I spoke to another friend and he said a de-cat is nto a good idea as it will fail an emmisions test.

Whats the best thing i can do?

Just go for a full cat back system and keep my existing down pipe? or can someone reccomend me some products,

Thanks from a n00b

[AlexMozza]

Cat back with a sports cat.
tbh, modern cats dont really affect the performance of an engine.

[stfc_gti]

Cat back with a sports cat.
tbh, modern cats dont really affect the performance of an engine.

i've found sports cats to be very expensive and above my budget at the moment, can i get away with just a cat back and keep my existing rest of the exhaust, of just get a standard replacement down pipe?

Thanks for your help/

[AlexMozza]

As far as I know you can, but I have not done anything with turbos.

[stfc_gti]

thanks for your help

to make it easier for anyone who may know i have found this back cat which i may go for
http://www.ebay.co.uk/itm/GOLF-MK4-EXHAUST-SCORPION-NON-RES-CAT-BACK-TWIN-OVAL-/330535272727?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4cf5700117

Would it fit right on to my golf, or would i need anything else?

Thanks

[barrym381]

that 1s fine if your just going for a cat-back 

[Wayne]

I spoke to another friend and he said a de-cat is not a good idea as it will fail an emmisions test.

He is correct, it will fail the mot unless you refit the cat for the mot.

can i get away with just a cat back and keep my existing rest of the exhaust, of just get a standard replacement down pipe?

No problems at all with doing that.

[stfc_gti]

perfect, thanks for you advice

i've done a bit more reading, im trying to get as much info as possible and have read that if i was to put on a new cat back then in order to get optimum gains, the fitting of a large bore downpipe and sports cat is a must.

Can you tell me how much of a MUST it really is, as allready stated i want to get the car remapped, but at this rate i will be waiting another 2 years as at the moment it looks like i have to fork out £1000 on part before i can do this.
 
Truthfuly how much of a difference will i see between a stage 1 remap on a mk4 1.8t 150bhp golf with a large bore downpipe and sports cat, compared to without it, and just a new cat back.
 
 
 
Thanks again in advance and sorry for being a n00b 

[barrym381]

http://www.golfgtiforum.co.uk/index.php?topic=222447.10

[stfc_gti]

http://www.golfgtiforum.co.uk/index.php?topic=222447.10

Yeah, ive seen this, if its still available in a few weeks (doubtful) once i know i can afford it then i'll consider it.

How much difference will it make with out it?