slow vtr engine

[ns9900]

having compared with someone else's, similar milage and models with no power mods, (only filter and exhaust system), with the same number of people in th car, i feel as though mine isnt pulling away at 3000rpm as fast. i have serviced it 2000 miles back, engine was warm, road was the same, wasnt windy, what could be causing this?

im pretty sure the exhaust difference (4-1 vs 4-2-1) cant make this difference.

could a filter sitting next to (touching) the rocker cover making the whole unit hot cause this?

[Tom5190]

All vtr's are slow. But if you have heat soak it wont help.

[ns9900]

do you think it's worth heat shielding the mani or is the heat shield around the alternator a suitable wrap for the filter?

out of curiosity, should i inc changing the gearbox oil as part of a service?