i know what a cat back is, bro, no need to clarify that...
what im asking is whether the lack of cat is liable to affect performance... in a word, you say no; thanks for your input 
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98 B14: eibach prokit, kyb agx/motivational, place racing cai, hotshot header, stromung cat back, strut bars, enkei tuners, short shift, clear tails, cluster swap, kenwood/pioneer/rf audio
03 SPEC: missing engine cover; nismo header w/o cat & AEBS o2 sim, nismo intake, nismo lowdown SOLD
05 FXT: Kartboy s/s, rockblocker
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