The words "cheap" and "boost" are a dichotomy, a dialectic, ying to yang.
There is no way to do cheap boost on these cars.
Best bet is a Paxton or Vortech tuner kit, a used SCT tuner and access to a good tuner or friendly dyno shop. ~$4500 plus whatever it costs to tune it plus any accessories like colder plugs, a BAP, T bolt kit, that you want to add.
You can try used like I did. I picked up a complete Vortech kit, which fortunately was complete and didn't have me chasing down little bits and bobs for eternity. There are well over 100 parts in the kit, many small, easily overlooked and hard to get separately if something is missing. Fortunately, nothing was, in my case. Very high quality components in the kit and definitely American-made.
Tuning it has been a bit of an struggle but, I am getting there.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP