1. Don't buy crap off-brand parts or replica parts on ebay.
2. Find reputable shops/tuners here:
https://www.tamparacing.com/forums/h...directory.html
3. Use quality parts such as full-race, tial, precision, aem, hondata, RC etc.
4. Don't skimp on engine management or fuel system etc.
5. Do your research. Plenty of information can be found via google.com and honda-tech.com etc.