I've decided to give the Librands Acoustic Trim a go......just ordered it and I'll report back later next week!
This is what Rob Wells at Librand said to me about it.
"Hi John,
I’m glad you got it sorted.
The Acoustic trim does not affect the performance, the smaller id just speeds up the gasses for the last 150mm, making some go into the sound absortion material.
We went well in Portimao, netting a 1st, 2nd and 4th in class with the Elva, TVR Grantura and Lotus Cortina.
A fantastic track, much like a roller coaster!
Kind regards
Rob "
Also sounds like he had fun in Portugal with some interesting cars!!
