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London Alfa if torque is what you are chasing take those bolt on filters off immediately!
I have a highly modified 1.5 t-carb and have tried a few different induction set-ups.
1. Bolt on filters. = no torque at all b4 4000 rpm. And not a pretty, but loud induction noise.
2. Original airbox = great torque even with highly moded motor, slightly poorer top-end power, and very boring induction noise!
3. The set-up I'm using now is a compromise. I'm using the original air-box but I have cut out almost the whole front section. I admit it will now be sucking in hot air from the back of the rad, but the difference in power is amazing! And the sound is the best I have ever heard from a boxer, combined with my big bore exhaust it now crackles nicely.
The main point though is torque is still far superior to that with bolt on filters, and with an improved sound and top end power.
Have fun experimenting, it is the best way to find what is best for you.
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