Many options are available from rear silencers to full systems replacing the cast manifold and even catalytic converter (removal of the catalyst is a competition only modification and may not be legal depending which country you are in). Replacing the standard exhaust from the catalyst backwards could release anything up to 10% more power but is best combined with other modifications to give a larger overall power increase. One drawback of all "free flow" exhausts is the increase in noise that will occur, quite often making a car unbearably noisy and thus tiring to drive for long distances.

Janspeed
DTM style rear silencer (Part Number ECC0131), Tubular Manifold (Part Number EM564), System featuring DTM style tailpipes which will either mate to the existing system from the cat back or to their own manifold (Part Number ES681), also available is a fully stainless system (cat back) and stainless backbox (no Part Number)
Peco
DTM Style backbox. (part number 505)
Supersprint / ANSA
Large single bore tailbox (Part Number 81.17.04)
OMP
Rear Silencer twin 63mm bore (Part Number QD/FI676/2R)
Jetex
Laser backbox 89mm single round tailpipe manfactured in stainless steel

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