According to Modern Performance, the 8.5 mm wires that have the right angle boots are for the SRT-4. I got the "oval" shaped Greddy catch can. It can probably hold almost a quart of oil and is bigger than I thought it would be. However, it fits in the SRT with no problem. The more square shaped one may hold a little less, but may give you more location options. I polished mine up, it had a little "battle damage" in shipment (nothing major) and looks sweet with those red connectors! BTW, if you need more tubing than they give you, Auto Zone has it in black only, made by Goodyear, SAE 30R7, 3/8" (i.d.), rated at 50 PSI. [sm=smiley2.gif][sm=smiley4.gif]