Im down to 2500lbs with still an ungutted interior. Major compromise I had to give up was AC delete for only 15lbs so I may consider putting that back in.
I did chunks at a time to feel the difference.
I did lighter wheels/tire along with lighter pulley
I did Lightweight Wilwood front brakes (-30lbs) and CF driveshaft
I did lightweight battery with rear seat delete
I removed front and rear bumper beam and same time
I did empty windshield reservoir & AC delete with spare tire/jack removal
The method was to keep the front & rear loss close each time to maintain the stock balance built into car.
Each time I noticed a drastic improvement in acceleration.
The OP's question will reducing reciprocating mass improve HP? No. But the car will get to the same HP #'s up high quicker is how I see it.
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