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Welcome in sigh. I had a GL twin-carb before I found the SiR.
What the GL needs is a decent cool-air box to start. You'll notice that your air pickup is inside the engine bay = hot air = decrease in power. This is the only model that I'd recommend a CAI for as there is no airbox and cool air intake. On top of that, a cam upgrade (Honda car club has the mugen spec grind I think and decent headers plus 2" exhaust setup can't hurt. The carbs can be modded to give better pickup - but I can't remember what was done to mine but I'll try and find out. I do know it was a simple tweak.
The better route that I was starting with my GL is to drop the ZC 1600 twin-cam from our Si CRX in. You immediately get 30bhp extra power - probably more than the mods to the 1500. Get a CRX front cut and it will all bolt straight in - hardest part is the wiring but Hanny's at Smithfield and a few other places can do it.
I'm based in Sydney if you need help.
Cheers
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