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> does removing the catalytic converter add HP?
post Mar 28, 2006 - 12:03 AM
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nate95

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Hey i was just wondering if i were to remove the catalytic converter if it would add any horse power? or what about getting a "Y" pipe before the cat. so i can still have the cat. but have it go straight out when i want to race?
 
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post Feb 14, 2016 - 8:47 PM
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Box



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Holy thread revival Batman!

How much louder depends on a lot of variables, but the smell of raw exhaust is enough for me to leave them in place. Back in the day when they were crudely implemented and they clogged if you looked at them funny yes there were gains to be had, but ever since the late 80's/early 90's or so they really haven't imposed much restriction. Nowadays on a 400+ hp car they might result in a 1 hp loss if that, so why is it people still remove them on a new car is beyond me.


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2001 Miata LS 5-speed

Posts in this topic
- nate95   does removing the catalytic converter add HP?   Mar 28, 2006 - 12:03 AM
- - hitcachi   No it doesn't. Sorry. You can argue better flo...   Mar 28, 2006 - 12:07 AM
|- - BLADDER_MASTER   QUOTE(hitcachi @ Mar 28, 2006 - 12:0...   Mar 28, 2006 - 2:18 AM
- - malpaso   Sorry for question from someone with low english.....   Mar 28, 2006 - 1:06 AM
- - 94wrc   Wrong, Or certainly wrong on JDM cars, when you r...   Mar 28, 2006 - 2:40 AM
|- - alexjb   QUOTE(94wrc @ Mar 28, 2006 - 2:40 AM...   Mar 28, 2006 - 2:47 AM
- - 94wrc   Good point, it may not help the N/A engines as the...   Mar 28, 2006 - 2:56 AM
|- - alexjb   QUOTE(94wrc @ Mar 28, 2006 - 2:56 AM...   Mar 28, 2006 - 3:14 AM
- - malpaso   Fine fellas, I'll try again... my exhaust has...   Mar 28, 2006 - 3:59 AM
- - bindertch   QUOTE(malpaso @ Mar 28, 2006 - 8:59 ...   Mar 28, 2006 - 6:13 AM
|- - Bitter   QUOTE(bindertch @ Mar 28, 2006 - 6:1...   Mar 28, 2006 - 7:21 AM
- - Insanity-74   Come on guys...get yer brains into gear ...of c...   Mar 28, 2006 - 6:43 AM
- - 94wrc   Ahh you frequent over here too Nial, I did think t...   Mar 28, 2006 - 7:03 AM
- - crismillencolin   Got a de-cat pipe put on last thurs and i can safe...   Mar 28, 2006 - 7:39 AM
- - 94wrc   You are the only person I know who has said it mak...   Mar 28, 2006 - 7:56 AM
|- - crismillencolin   QUOTE(94wrc @ Mar 28, 2006 - 7:56 AM...   Mar 28, 2006 - 8:48 AM
- - Insanity-74   Another good thing I tried for the first time at t...   Mar 28, 2006 - 8:59 AM
- - Vacchus   This was the first thing that i did to my car, and...   Mar 28, 2006 - 9:19 AM
- - 94wrc   Ahh the pesky restrictor, get rid, I did and I hav...   Mar 28, 2006 - 9:39 AM
- - nate95   how hard is it to remove?what do i have to do to t...   Mar 29, 2006 - 11:56 AM
|- - Yellow94GT   QUOTE(nate95 @ Mar 29, 2006 - 11:56 ...   Mar 29, 2006 - 9:58 PM
- - hitcachi   QUOTE(BLADDER_MASTER @ Mar 28, 2006 - 2...   Mar 29, 2006 - 10:17 PM
- - malpaso   And what about oxygen sensors (lambda probes). I t...   Mar 30, 2006 - 1:08 AM
|- - Bitter   QUOTE(malpaso @ Mar 30, 2006 - 1:08 ...   Mar 30, 2006 - 1:45 AM
|- - malpaso   QUOTE(Bitter @ Mar 30, 2006 - 8:45 A...   Mar 30, 2006 - 1:55 AM
- - Bitter   ignition timing is different than valve timing.   Mar 30, 2006 - 2:20 AM
|- - malpaso   QUOTE(Bitter @ Mar 30, 2006 - 9:20 A...   Mar 30, 2006 - 2:26 AM
|- - Bitter   QUOTE(malpaso @ Mar 30, 2006 - 2:26 ...   Mar 30, 2006 - 11:54 AM
- - Niskyspy   For about 6 years I though that removing the conve...   Mar 30, 2006 - 6:53 PM
- - kenjamatic   i don't know if removing your cat or putting o...   Apr 9, 2006 - 1:08 PM
- - Batman722   ok first... most US Celicas have 2 cats (primary ...   Apr 9, 2006 - 2:21 PM
- - TheStreetzKing   i punched out my cat when i did my exhaust.. made ...   Apr 9, 2006 - 3:16 PM
- - j0e_p3t   QUOTE(Batman722 @ Apr 9, 2006 - 12:2...   Apr 9, 2006 - 3:29 PM
|- - Batman722   QUOTE(j0e_p3t @ Apr 9, 2006 - 4:29 P...   Apr 9, 2006 - 6:34 PM
- - TheStreetzKing   all i did was punch out my secondary, i mean obvio...   Apr 9, 2006 - 3:38 PM
- - j0e_p3t   QUOTE(Batman722 @ Apr 9, 2006 - 4:34...   Apr 9, 2006 - 6:42 PM
- - Batman722   I have a 95 ST just like you, I have a header (cor...   Apr 9, 2006 - 7:32 PM
- - Bitter   how much of a difference did the header make in te...   Apr 9, 2006 - 7:34 PM
- - FAQdaWorld   On a NA 7afe, removing the cat will result in a co...   Apr 10, 2006 - 2:30 AM
- - kenjamatic   little off topic...i just got my headers on last n...   Apr 10, 2006 - 2:48 PM
- - Negative   QUOTE(FAQdaWorld @ Apr 10, 2006 - 7...   Apr 10, 2006 - 5:36 PM
- - spke719   just take it all off.....i took off all of that st...   Dec 3, 2006 - 9:51 PM
- - hitcachi   ummmmmm, 8 months later, ok....   Dec 3, 2006 - 9:55 PM
|- - spke719   QUOTE(hitcachi @ Dec 3, 2006 - 9:55 ...   Dec 4, 2006 - 9:29 PM
- - n1ckz0r   QUOTE(bindertch @ Mar 28, 2006 - 8:1...   Dec 5, 2006 - 12:13 AM
- - BonzaiCelica   I've read a straight pipe in place of converte...   Feb 14, 2016 - 6:43 PM
- - Box   Holy thread revival Batman! How much louder d...   Feb 14, 2016 - 8:47 PM
- - BonzaiCelica   Google didn't pull up any other threads. I swe...   Feb 14, 2016 - 11:41 PM
- - Jmk91   Yes it makes your car louder, but not that much lo...   Feb 15, 2016 - 1:25 AM
- - BonzaiCelica   A stainless header added to a beams motor adds 5 d...   Feb 15, 2016 - 3:12 AM
- - Box   If sound level is the main concern you can put in ...   Feb 15, 2016 - 3:58 PM
- - igpx12   What I'd recommend is mocking up a flanged pip...   Feb 15, 2016 - 5:55 PM
- - njccmd2002   Removable test pipe   Feb 15, 2016 - 6:22 PM
- - BonzaiCelica   But what frustrates me is the fact that all these ...   Feb 19, 2016 - 12:21 PM
- - Box   The direct fit ones are identical to the original ...   Feb 19, 2016 - 2:03 PM
- - BonzaiCelica   What I recently bought. But my question is what ty...   Mar 13, 2016 - 9:11 PM


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