The PHR Billet diff cover is aimed at Supras making in excess of 900rwhp or more or those making trips to the drag strip. Weather your doing hard launches at the track or a dig on the street. This is a vast improvement over the stock cover which is thin and week. Keep you car together. You make power, now make that power work for you instead of against you. The PHR cover comes with machined fins into the cover to help cool your rear end as well, so it's suited for street, strip, or track. Suitable for only 220mm big case diffs.