Weight. That's your big challenge. Lighten it as much as possible. Yes cats, exhaust, and remap would help but it'll only give you 296-300bhp from 276.
Okay so maybe the person driving this car hasn't seen this or isn't on here but you need to learn the rules of the road or learn some manners. When cars are parked on your side of the road it's not your right of way. My girlfriend was not impressed as she had to brake hard to let you through. She's the one who spotted you, I was at work.