If you change the exhaust, you need to be able to adjust the fuel mixture to match it.
If not, lots of problems await.
Go for it, and get a tune and you will be amazed at the difference.
Ecu flashing; contact smithabusa, he is a sponsor here and makes the harness to connect your computer to your ecu. The software to flash is free to download. Boost by smith's website is: boostbysmith.com - Home and the website for the flash forum and software download is available through his website.
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