Cobb Catted Downpipe – Hellas – Perrin Endlinks

This weekends install started as Hella Horns, Perrin Endlinks, and Perrin sway bars. Unfortunately, the sway bars have been waiting for about a year so really its unknown whether they came with bushings or perhaps they were lost somewhere in time. At any rate, on to what we can install.

Cobb Catted downpipe

Going with a catted downpipe over the cheaper more popular catless options, allows you to actually not spit fuel out the exhaust and pass emissions, usually without cheating. Installing is not too difficult as long as you can get under the car. I’ll lay out the tools required and steps.


  • 14mm socket
  • 12mm socket
  • 14mm box wrench
  • 12 mm box wrench
  • needle nose pliers
  • 10mm socket
  • 22mm box wrench or o2 sensor remover


  1. Lift the front of the car on stands or ramps
  2. Remove turbo heat shield
  3. Remove turbo heat shield bracket
  4. Place bolts in bracket in a way that its easy to know the orientation when reinstalling
  5. Remove remaining downpipe nuts.
  6. Remove o2 Sensor
  7. Remove downpipe bracket bolts from the transmission and the other one, you’ll see it.
  8. Remove downpipe either as one piece or two
  9. Reinstall the new downpipe
  10. Install the o2 sensor.
  11. Cut the heat shield to allow the downpipe or install an aftermarket heat shield.
  12. Wipe down the grease before starting up the car otherwise you might get blue finger prints when everything gets up to temperature.

Perrin Endlinks

Hella Horns

The hardest part about installing the horns is wiring up the relay. The diagram is a little difficult to interpret so I’ll mention it here.

30 – fused power (to battery)
87 – horns (Y slip wire to each horn)
85 – Ground (bare metal)
86 – stock horn wire (self explanatory)