I used affiliate pin on my Challenger Scat Pack, it was 4.2% off MSRP. I don’t believe the Scat Packs are technically considered SRT models. However it’s entirely at the dealership discretion, many dealer would not do affiliate deals, I had to drive about 2 hours in a neighboring state to find one.
For reference, here is my challenger deal: Signed: 2020 Dodge Challenger Scat Pack - $43,380 MSRP $2250 DAS $334/mo @ 24mo Balloon