Larger diameter yerh my friend once had it on his car a while back now and he started his car up next to mine on a cold day and walked out to let it warm up and it stalled infront of us lool i think tooo much air was going in or somthing like that but it was pretty funny just chocked and died lol but was fine after just sharing stories =P It's basically the same pipe dude. The larger diameter wouldn't increase the airflow that much to stall it I think. Hmm. I'd say his maf sensor was a bit grubby? errr nope. CES is slightly bigger, and yes my car wants to stall when its cold, but only when I'm on the throttle slightly and its freezing cold. Its never stopped by itself. Stoopid noobzor. Yew shood lrn 2 read n look into wot people write moar proper kekekekekekekeke lulz. Mine's never stalled either dude, and our climate here is far colder to that of Melbourne. Do you have the CES intake on there now? edit: Yes, I'm a d!ck and I should elaborate more on what I say in the future. Mmhmm.