i have a 48ida side draught webber set up in a blow through turbo system on my 12at

would this webber be too big for a stock 4k ??? if so what about a modded one?

:) umm, a 48 IDA is a downdraught carby.

 

you can get a 48mm DCOE which is a side draught, so I'm assuming this is what you have.

 

to answer your question, NO the carby is not too big, but no doubt the JETS/CHOKES inside it would be.

 

get on ebay and do a search for "weber" only and you'll get about 5 pages of stuff. amongst it you will find suitablt sized jets for around $7 each. :)