Right, so, as cockups go I'd say this was quite a good one. Initially when installing the TIP I took it to a garage my mate works at to pick up some bits and was offered to install the TIP using one of their ramps. Great I thought, easier access, loads of tools and a qualified mechanic on hand.
Installed the TIP perfectly fine until we got to the smaller pipe on the top of the forge 007p which wasn't long enough, so the qualified mechanic came up with the idea of using a connector and a bit more length of pipe. Which by looking at it seemed like it should work fine.
However I looked at it today and the "connector" didn't actually have a hole through the middle and was effectively acting as a bung. Replaced this whole pipe with a new section of longer pipe, clipped it all in tightly and took it for a drive.
Seemed to release the air with a whoosh like it used to except its a lot quieter now, I've read that it is quieter with a TIP installed on a non mapped car on ukmkiv's. So I'll do a log with vagcom later on in the week to see if the TIP has had any improvement over the standard TIP.
However thecar does seem to be a little more powerfull now but that could be because I got used to having a malfunction running on the car it also doesn't hesitate at 4000 rpm like it used to now, so I'm kinda happy, apart from losing some of the childish loud whoosh noise.