C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Hooker 2151s

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Old Oct 14, 2021 | 12:51 PM
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Default Hooker 2151s

Anyone with a zf car have the hooker super comps installed with the hooker y? I've been looking through old threads and have read that the y is hit or miss on fitment, mainly with the auto transmissions. Any pics or advice would be appreciated

I ordered a set of headers from TPIS, and while I understand they pretty much fit the best, I have been waiting since JUNE and every month or so I get an email saying it's been pushed back.

Also, before I get the typical "gO TRuE dUaLs", I don't want to.
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Old Oct 15, 2021 | 09:32 AM
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2149/2151 headers are good for a 30 year old design off the shelf part, the y pipe fit is hit or miss, generally has to be heated and bent so you do not end up with gasket issues. Any competent muffler shop can easily fit the hooker y pipe for you.

The trouble isn't so much the pipe, but production tolerance of blocks, heads used can drastically change where the collector ends up, a 1/4" up top at the head can become 2" down by the collectors. Not really hookers fault. It's a decent piece, to get a y pipe that fits better with a 3 bolt collector flange would require individual fitting. This and others use a slip joint, or a ball and socket to avoid fitment issues, hooker expects you to do exhaust system work when Installing it. Pick your poison, money up front, or time fitting a less expensive aftermarket part.
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Old Oct 15, 2021 | 09:42 AM
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Thanks for the input. I guess the same thing could happen with the tpis y at the end of the day too. I'm just hating the idea of starting the car up for the first time in my neighborhood with open headers and pissing off the neighbors (just moved in. HAHA)

I could get some small glass packs or something if there is space and just slip them onto the tpis collectors, but I don't think that's gonna do much for the sound
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Old Oct 15, 2021 | 11:55 AM
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A pair of short, cheap glass packs welded to a 3" 3 bolt flange would get you to the exhaust shop, pretty cheap. Honestly you are making a mountain out of a molehill. Bolt up the headers and y pipe, if it leaks take to exhaust shop and have them heat and bend it so flange alignment is good, and put another set of gaskets in it. The aluminum ones at AutoZone work well, be sure to retorque after they get a couple heat cycles, reusable. Personally I used hkr-2149 and stock 92-96 lt1 exhaust, had to weld a couple extensions on each pipe and flanges. It's quiet, no drone, but no converters, so if smog check is in the future that wouldn't work for you. But been told by many I trust that the headers and exhaust setup I have will support 400 rwhp all day long. For using factory exhaust that's hard to beat, ZERO DRONE. yet sounds good idling and when you get on it you can definitely tell it's not a stock 350 (built 383, miniram, afr 195 eliminator heads, 228/232 @ 50 .576/.576 110 lsa, around 450-475 hp, 475-500 tq) for a stock l98 it will sound good and still be very quiet dude I promise! Oh,and paid 150 for complete lt1 catback system off Facebook marketplace. I'll get a sound clip for you.
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