Purchased this along with the GPF and the M365 upgrade (From M330) and will review the M365 after a few more miles. The downpipe is a lovely item, very well built, fits very nicely and sounds great. The only problem I had was fitting it, we could not get the nuts undone on the turbo end and after much swearing stripped the threads. This then meant ordering a new set of studs at a cost of around 17 quid but a lot of extra work to replace and refit. This is not Mountunes fault so I will not drop a star, but be aware because my local Ford dealer said this was not uncommon. If a set of studs were included in the kit it would have saved me a lot of time as the car ended up off the road for two days while I waited for the parts. All done now though and very pleased, hopefully never to be removed! No regrets.
I had this fitted along with the sports gpf to complete the full turbo-back mountune exhaust system. Not the easiest part to fit though due to the bottom of the three nuts at the turbo being quite hard to reach, but got there in the end. After fitting it immediately felt like the turbo could spin up more quickly. The full exhaust system combined with the m365 calibration makes for a very quick car. Torque all through the rev range and no need to change down a gear for motorway overtakes. All in all another excellent part from mountune who just keep making the Mk4 ST better.
Great looking and fits perfectly also feels like it’s freed up the engine a lot pulls hard on acceleration now.