Unfortunately it is all custom work- Spec'ing them isn't done- I am in so cal now so I am looking for another fab guy down here- If I do I will see if I can get you in the loop- My intake I built originally in a 3 inch diameter; and I just re did it to 3 and half inch, connector and plenum. Most imports do 3 inch and through my speed shop in Reno was able to find a silicon connector (3.5") to match the MAS size(really cool)- My guy was clear that a cold air intake would really promote performance...Tone apparently has cold air box(es) but for the supercharger configuration