Once again, our spies have spotted the upcoming range-topper Porsche 718 Boxster Spyder undergoing cold weather tests. This time, it was seen filling up at a gas station and was accompanied by several 992 prototypes. This gave our spies a chance to get up close and personal with the Boxster Spyder. In fact, they even gave us a peek inside the cabin.

Spied: Porsche Boxster Spyder

Looking at the photos, it appears not much has changed on the 718 Boxster Spyder. There is still the signature humped engine cover together with the manually attached soft-top, signifying it as the range-topper Spyder variant. At the front, it sports a slightly tweaked front fascia, with larger vents to differentiate it from other Boxsters.

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Spied: Porsche Boxster Spyder

From the side, it appears to also be wider than the standard Boxster models and comes with larger intake vents. The biggest difference would be the vehicle's rear end as it fitted with a very prominent rear diffuser and larger twin exit exhausts.

Spied: Porsche Boxster Spyder

Inside, it seems as though Porsche has left the cabin the same as other 718 Boxsters. The only visual difference would appear to be the fixed carbon fiber bucket seats. Also noticeable on this prototype is a standard manual transmission.

Spied: Porsche Boxster Spyder

Unlike other 718 Boxsters, the Spyder is said to use a naturally aspirated flat-six instead of a turbocharged 2.5-liter flat four. It is even rumored that the Spyder will usa detuned version of the 911 GT3's 4.0-liter flat six. As mentioned earlier, this test mule is sporting a manual transmission. However, it is possible that a PDK dual-clutch transmission may be offered as well.

It is expected that the 718 Boxster Spyder will make its debut later this year along side the 718 Cayman GTS.