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Thread: teach me about sport cats

  
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    purple pride's Avatar
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    teach me about sport cats

    ok i have an astra coupe turbo and have decided to take it to around 290-300bhp with 350+lbs torque. i have a clear idea of everything else but i want to know about sport cats. i know there more free flowing, but why, is the material inside different? what diameter inlet/outlet should i get? whats better..100 cell or 200 cell? any gen would be great, ps im buying the cat alone and welding it in place of the old one, i allready have a cat back and a de cat at the front.

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    come on, someone must know about them...

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    the sports cat simply replaces your oe factory one - no need for welding

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    the number refers to the cpi or cells per inch. standard cats have a density of around 500cpi, whereas sports cats have a lower density. race cats and sports cats are different apparently, race cats being even more freer flowing.
    jimbo
    ASTRA MK4 GSI TURBO
    WAS CS3 268bhp & 282lb/ft
    NOW CS4 279bhp & 336lb/ft

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    Quote Originally Posted by 888rich View Post
    the sports cat simply replaces your oe factory one - no need for welding
    Some sports cats just come as the cat with out the pipes and flanges so need to be welded to the oe pipes. the oe pipes are normally narrower so you won't get the full benifit of a complete sports cat exhaust as in the miltek
    SMIC, miltek catback, precat, Thorney remap 242.7 bhp 281lb/ft torque

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    Pete's Avatar
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    I`ve got 2 100 cell sports cats on mine from Dynatec
    My Project Auto-Biography Thread: Skin of an Astra - Heart of a Monaro - Click here to read more!

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    how much were they pete? can they be mig welded? will i be better off with a 100 or 200 cell?

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    Quote Originally Posted by purple pride View Post
    how much were they pete? can they be mig welded? will i be better off with a 100 or 200 cell?
    When I had the Z20LET, I had the Courtenay 200 cell cat and it was fine and ok for immissions too, and yes you can tig weld them.

    The Dynatec ones came from the states and were £100 each, £285 each over here.
    My Project Auto-Biography Thread: Skin of an Astra - Heart of a Monaro - Click here to read more!

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