I have a 2011 cars an was wondering if its ok to upgrade the exhaust and air filters without doing the remap at the same time. Im getting a lot of different views from friends weather I can or not.

Hope you can put this to bed for me.

2011 vrs....

you can upgrade the air filter, be it a replacement filter or full induction kit and the ECU will adapt the Air Fuel Ratio to the new and improved airflow without any mapping being needed.

Exhaust wise the answer is yes and no. The exhust comes in two sections. The downpipe section (from the turbo to centre point of car and includes the catalytic converter), this is the section where all thepower gains will be found. The Cat Back Section (this starts at the centre point of the car and finishes at the tail pipe(= and includes all the silencers), this section will give you negligable power gains but is where the extra noise comes from.

A Downpipe with a Sports cat or decat will require a stage 2 remap.

The Cat back section can be done on a completely stock car with no changes required.

Thanks for that vRSy, go and look at some exhaust then. Just have to wait a little longer for the remap. Cheers.

If you want to know how the different exhaust sounds like, here is the Jetex-system with 1 and 2 mufflers.

2 mufflers, stage 1, Forge CAI-kit

1 muffler, stock software, stock airbox.

Thanks for that vRSy, go and look at some exhaust then. Just have to wait a little longer for the remap. Cheers.

What about the TMC tunign box. its not my cup of tea personally, but others on here have used them with great results. Its removable as well.

Thanks confide, very raspy on second vid. Sounds nice, nice power gain in first and not overly noisy.

Thank you.

I use the system with only 1 silencer day to day.

If you keep it easy on the gas, it's actually hard to hear a difference inside the car.

However, when you floor it it's a BIG difference =D!

Can you just add on to the single system once you remap???

What about the TMC tunign box. its not my cup of tea personally, but others on here have used them with great results. Its removable as well.

don't know much about tuning box, always thought remap would be better in the long run.

You can add a cat back exhaust irrelevant of any other tuning. It doesnt effect anything.

The downpipe needs a stage 2 tune. So if you stage 1, then you need to look at upgrading the remap to stage 2. Typically it is £50-100+VAT for the upgrade from stage 1 to stage 2 from most tuners, unless you go with APR then its a free upgrade.

You will get faultcodes for the sports-cat, there is however a solution in form off a spacer which sends the lambda out abit and removes the fault.

EDIT : some people claim that the fault comes from exhausts passing too freely... I don't understand how and I'm not saying it is that way, but that is the words I've heard.

If it's not like that, please say so =).

Edited 10 April, 201313 yr by Confide

Thanks vRSy,APR was the map I'm looking at, the read up looks good.

I ran round for a fought night with a full Milltek decat, no map, no issues, no warning lights & no change in fuel consumption.

Some people dont have anything flash up, others do.

When I had the shark map with the decat i could go a couple weeks or so and then it would flash a warning lamp at me with the fault code about emissions over threshold or something like that. Eventually it got turned off full time though.