Hi, kjohnson!
Thank you for your question. The Delta 52667-15-BG shower head does have a 1.5 gpm flow rate. There is not a way to get the flow rest restrictor out. Doing so may void any warranty the shower head may have. We do have the 52667-PK that is 2.5 gpm. Here is a link to this:
https://www.deltafaucet.com/bathroom/product/52667-PK
Best Regards,
Rosanna
Answered by: Delta Faucet
Date published: 2018-07-13