Time to build the exhaust system – a bit of a challenge to make sure it clears both the chassis and bodywork.

I temporarily put the bodywork back on once I’d done the engine & gearbox mounts to check everything will fit OK since the spyder has the lowest of rear clam of all the models:

Looks good – so time to start making an exhaust system.

I tried to do something in CAD

But quickly hit the limitations of 2D CAD, so just decided to have a go and crack on.
I’ve always viewed making headers as “dark magic”, it’s a tight fit to clear the chassis.



Am happy enough with the first three pipes, but the 4th was not so good:

I redid the final one on this side, I think it’s come out much better and tweaked the geometry of cylinder 3 to give a bit more clearance and level out the collector (not shown in this pic)

Next up was to build the rest of the exhaust system. I wanted a crossover since this will hopefully give it a nice “balanced” sound, plus if it’s too loud I can replace the crossover pipe with resonator. You can see in this picture that the throttlebody is still at the rear of the engine. I was hoping I could flip the inlet manifold around to have the throttle body at the front, but just in case it’s not possible, I made sure to just about leave enough clearance at the rear for it

I think it came out OK. Pretty hard to get it looking symmetrical from all angles.