Had a local fabricator made these custom 4" stainless GT3 tips (ceramic coated) for the TPC GT3 exhaust. It looks so much better! Contact me if you want the fabricator's info. Great price and craftsmanship.

 

are they far enough away from the plastic shroud (so it doesn't melt)?

they look great, I'd love the details!

Oh - and how large are each tip (in mm if possible)

 

Plenty of clearance between the tips and shrouds.. If I do my math correctly, it's ~ 101.60mm.. Basically had the fabricator replicate Sharkwerks 100MM GT3 tips but longer at 7.5" to accommodate GT3 exhaust conversion. Made his job a bit easier by sacrificing a stock set of GT3 tips to retain the factory flange and welded on new angle cut 4" stainless piping.

 

They look nice...similar to Sharkwerks and must cost less too. Here's a photo of my Sharkwerks for those that want to compare.
Sharkwerks tips for GT3 conversion muffler for GT4

Sharkwerks tips for GT3 conversion muffler for GT4

 

They were cheaper for sure plus I was able to get it done the same day... Ball'n on a budget

 

Do you know if they make the sharkwerks style tips that bolt onto the OEM GT4 mufflers?

 

Think both Fabspeed and Sharkwerks already make similar tips for the GT4's OEM muffler.. However, I am sure the fabricator can make you a set... Just PM me and I will get you his contact info.