[Tim Corcoran]

I installed my new Doug's headers and have a couple questions.

1. By installing the small extension will it have any effect on performance. I know the purpose of the extension is so you can attach exhaust in a street car.
2. For maximum vacuum exactly where to install the evac tube in the collector.

Thanks

I have seen some posts that they cannot install the full size filter with Doug's headers but I have plenty of room to remove the full size filter with 1-7/8 round port.