No turbo car is going to beat a naturally aspirated car with headers in a noise competition. But, if they have different categories for Turbo and Non-turbo then you definitely have a chance and I hope you win!

Don't know how accurate a sound meter app is but I guess for just loudness and not sound quality it may be okay. You can just buy a proper one for like $15-20 USD:

https://www.amazon.com/BAFX-Product...+meter&refinements=p_72%3A2661618011

Last edited by Salomon Ponte; March 26, 2017 02:21 am UTC.
'92 Talon TSi AWD - 5 Speed/E16G/12.385s @ 115.13mph