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I was wondering if some one would be able to help me, i have a b18 in my ej9 with the old 1.4 exhaust and have finally got some money to buy an exhaust sytem and inducation kit was wondering what the best inducation kit is and and what the best size for exhaust 2.25"/2.5"/3"

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I'd recommend a 2.5 system. Look for induction kits which fit the B16 as it'll fit a B18.
 

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Bigger bore allows easier breathing. The quicker the gases can escape the quicker more air can be pulled in so a higher potential power.
 

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Don't go bigger than 2.5" unless you are planning on going boost. N/A systems like a bit of back pressure! Decent off the shelf systems vary from 57mm to 63mm, the majourity seem to be around the 60mm mark.

As for intakes any B-series intake will work. The best intakes are the ones that go from big to small as this creates faster airflow e.g. The AEM V2 and J's Racing Whale Tail.
 
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