That's a great review , The guys doing this would like me to pass on their thanks for helping as it was really important before making a full batch that they understood how the fitting would go for a typical guy doing it in his garage, and your point about the one with the wider slot being easier to fit was just the type of info they needed.
It's excellent that you consider them to be of OEM quality and standard as that was what they were wanting to achieve and improve on by using Stainless Steel over the Steel ones supplied with the tips.
Because they are perfectionists even thought they are not available to buy anywhere else without buying the tips as well they still wanted to manufacture the very best product they could.
These are UK made by a company in Dorset and not some dodgy quality stuff from Asia.
I will keep you posted as to when they will be available, but JMBs phone number and web site are on the card in the photos so please feel free to contact them.
I think the first batch will be for 997.1 and 997.2 cars fitted with non PSE exhausts and I will keep you posted on progress with inserts for PSE cars.
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