An open header test run with a 2004 Honda Goldwing GL1800. Modifications that have been made are K&N air filter, pair valve is blocked and the fuel evaporative system has been removed. The computer has not been flashed and does not have any issues. The stock O2's are still in place and running the stock mapping.

This exhaust set up is only temporary as it is only in transition to another form. I wouldn't suggest this set up as you loose torque do to minimal back pressure.

Thanks for watching!