What do you guys think about offering big aeroports for sale ? Big as in ports fitting up to 12 inch diameter pipe, hand made, out of fiberglass. Better results compared to using multiple small ports, easier to tune, easier to get the needed port area, no more troubles with couplers, or pipes not long enough, or ports not fitting right. Here is how the versions for 8 inch and 10 inch pipe look: Raw 8 inch version on a piece of pipe: If anyone can post some accurate standard pvc pipe measurements (ID and OD) it would be useful to see if the size standards are different between US and Europe.