What are the specs of a "s300G"? I am running an s300, but there are tons of them available in all differant sizes. My s300's specs are 62/65/12, but there are differances from a "Stock s300" My turbo has an aftermarked turbine housing with a modified scroll allowing it to flow more exhaust then a stock 12cm housing, the wastegate is also much larger and is allowed to swing open further due to the deeper well on the compressor housing. I am running this over an s400 turbo with a 75mm compressor wheel and a 1.32 A/R ratio turbine housing. Like I said there are lots of s300's available as there are s400's. s300's range from a 57mm compressor all the way up to 71mm, the turbines some in differant sizes as do the turbine housings. S400's dont come in as many sizes, but there are quite a few of them as well.There are WAY to many options to just throw out there the trm s300/s400 compound turbo set. Some will work great, some will work OK and some will not work worth a damn. Do some research and get back to us.