sorry i didnt answer your other questions. yeah i can get you the shorty pipe. and i can special order your maf if your like it bigger. im assumin you want over 3 inches? if so im sure i can arrange this at a later date. but if youd like to order just the shorty pipe i can do that. yes inside will be carbon and since the process involves a mandrel. and wax the inside should be super smooth. thats in order for the carbon to slide off so to speak once it is cured. im not exactly sure what the manufactures process is but this is the most widely and cheapest way to make composite cylinders. let me know exactly what you want and i can get it for you. it may be more expensive if it involves having to get a different order of sleeve but im sure it shouldnt be too much more. the manufacture will be ordering stock according to the amount of people getting in on this. so the earlier the better. thanks.