R60BBA said:
De-catting gives off the constant smell of fuel...which is even more amplified in a 2 seater convertible.
I would get the car mapped to enhance real world drive ability but wouldn’t bother with a de-cat unless the car was being used for track purposes.
Having said that it’s totally up to you
I'd agree that de-catting does cause a fuel smell, but only if you completely de-cat. The 35i has four cats, two primary cats in the downpipes, and two in the centre section (full duel exhaust).
Removing the front two hasn't caused the exhaust to smell any different as far as I can tell. Its doesnt affect the MOT, and makes the car sound quite a bit more 'throaty', without the drone thats all to common from a full custom exhaust.
There really isn't any downside other than the pain in the a$$ job of fitting them.
As far as upgrade advice, I would recommend
(In order of power gain)
1. MHD
2. FMIC (Front Mount Intercooler).
3. Decat
MHD is purchased in two parts, the app itself is about £100, then £45 for each map.
Obviously it would make better financial sense to upgrade the FMIC and Decat before MHD, as you would only need to buy the app and Stage 2+ map.
Once you purchase a map, you can flash any fuel version, and you have access to any updates. V7.1 is out at the moment, and V8.0 is in beta.
The map options make take MHD from a good to great tool in my opinion. The exhaust burble is especially good fun - In the latest version you can even choose the burble aggressiveness and to only have it activated in sport mode.
