I liked my Injen setup. Its built and engineered well. I really like the heatshield setup. And It makes your turbo like 10x louder . The only reason I sold mine was cause it didnt fit with my aftermarket turbo setup.

 

Some people just get tired of their parts after a while and want to try new things Injen is good I had it for a while and then sold it for a aem

 

I've sold parts because I went a different direction with the build or because I sold the car and wanted to recoup some of the investment in it.

Still I'm not ashamed to say but I have bought parts before in the past and sold them to make a profit if I saw my build didn't necessarily need the parts or I could do without and go a different route. As long as you're upfront about what you're doing its all good.