ive run k&n for years on other vec. with no problems, but if it were me, id stay with a dry filter for the t4r because of possible fouling of the MAF. not everybody has gotten this problem but to me its not worth the rough running , stalling out while driving, lower mpg, etc. when/if it happens. & yes, that can happen , its a little scarey. not to mention, having to clean the TB more often. , for mr. banks...- i bought the volant brand new, (wet filter) in less than a year, it fouled the MAF. so i went with the volant DRY filter, & it works great. by the way, the volant is not truly sealed off from the engine heat, (easily fixed tho) neither is the k&n, therefore its not as much of a cai as the stock box. id say either just mod the stock box, or get an AFE OR TRD intake, you could mod the volant tho. again, i like the k&n, i just think there are better choices for the t4r.