This catalyser by-pass fits :
> All the 993 that originally have a Bischoff style catalyser
The 993 are originally equipped with one of two possible types of catalyser. The most frequent is the Bischoff type, with its two oval shaped inlet pipes and its two entry flanges at a 45° angle with the catalyser. The other type is the Gillet, which has rounded entry pipes that are at a 90° angle with the catalyser.
This version does not have catalytic converters. In France, the reglementation is such that in order to pass your MOT you must have catalytic converters. Therefore this version is not compatible for a car that needs to pass the French MOT. What this exhaust does, is improve the air flow and give a decidedly sportier sound. You should also expect a power gain of around 8hp compared with a 993 stock.
Our range also includes the following references for the Bischoff type cats:
> A standard 400 cell catalysed version - (Reference : SCA 993 2 1 B)
> A 100 cell, sport catalysed version - (Reference : SCA 993 2 2 B)
The same variations exist for vehicles fitted with the Gillet style cats.
Our exhausts all fit onto the original interfaces. By this we mean their entry, their outlet and their size are the same as those of the original part. They can therefore be fitted in replacement of the original part without requiring any modification. The flange is adjustable to make fitting easier.
The cats fit under the car between the headers and the mufflers, which are in the rear wings. In order to remove the original cats we recommend you unplug the Lambda probe, which is easy to reach in the middle of the cat. The 3 bolts on either side of the entry flanges are often difficult to remove, so plan to loosen them up well in advance with a good lubricant. You will need to use a car hoist. It isn't easy to retrieve the Lambda probe so be prepared to buy a new one or have one already to hand.
On average, it should take about 2 hours to fit them including the time taken to dismount the original exhaust. It will be faster if the exhaust you're removing is in good condition, just as it may take longer if the reverse is true.
The bolts must always be tightened progressively across the entire set of bolts.
To ensure that our exhausts are fitted under the best conditions, a mounting kit containing: gaskets, stainless steel bolts, stainless steel lock nuts and high temperature copper grease, is included with your exhaust.
Gain Vs Original: 9.6 Kg