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Ensure the oxygen sensors are plugged into the correct connector for each bank/ecu and not switched over/mixed up

If same

Swap front o2 sensors left n right

Could be faulty o2 sensor miss reading causing missfire on one bank

there are some tools which can read the sensors data, then go around and see if you can check things like battery level.

likely a battery in sensor getting old, when 1 goes the rest follow

Cylinder 4 issues, You realise Mrc lift the knock threshold limits when tuned?...... its a pet hate of mine which i found when i read my ecu's. NEVER run anything other then 99ron But i agree with the post about them, made their name and now using the groups followings into a false security and ripp...

Radtec oil coolers are in the £300's? fit factory and don't cause noises like forge cooler is reported to make

You have to lower the engine to replace the drivers pipe if you're using genuine pipes.

Sure i seen it done by lowering subframe and engine together etc

Oh, there is one drawback - the non-sport mode is sluggardly. It will pick up its skirts, but the throttle response is dulled and feels like it wants to resist you. I don't use non-sport mode. Ever. That is because MRC soften the non sports mode pedal mapping massively. I have yet to find any VVT m...

if you're respraying the whole car, I'd say replacing the oil cooler whilst front bumper off for painting is the best choice

Surprised these haven't been made by the likes of radtec yet tbh

My suggestion would be to go to place that does aircon and is friendly, run the system with the pipes hooked up to the aircon machine gauges. clearly it runs ok but struggles in summer could be a pressure problem Watch what the gauges are doing, it'll highlight any system issues like a blockage. for...

Bobby, what size pipework did you order? I've got a milltek cat back and looking for a straight fit job

personally i'd change the headlight switch first and try it

Quattro tech Peterborough can do it

Really interesting in these zinram pipes

I’ve had their Audi TT mk1 downpipes kit before and it was epic quality but didn’t fit the RHD chassis

My only concern is how low to the ground these will be as standard cats are quite slim shaped