Sidepipe insert mufflers
Drifting
Joined: Aug 2016
Posts: 1,791
Likes: 934
From: Arizona
They should drop right in. Do like the Classic Chambered inserts - they have 3 or 4 small longitudinal cuts in each end, on the bell. You bend the metal outward slightly at the cuts so it automatically sizes itself to your pipe when you push the insert in. Presto, no rattling or moving around.
Drivers side header is in so going to get some anti seize tomorrow and will slide the pipes on the headers before tightening everything.
Thesw inserts looked like this, no cuts on the end
Thanks again
Thread Starter
Racer
Joined: Jun 2022
Posts: 482
Likes: 202
Where have you seen a place other than below to buy them?
https://www.spiralturbobaffles.com/
https://www.spiralturbobaffles.com/
Le Mans Master
Joined: Mar 2001
Posts: 6,240
Likes: 1,013
From: Watkinsville, GA and Glen Cove, NY
The baffles are great and Jim is a great guy to deal with. I did some of his early Dyno testing. On a 440hp big block, the Hooker reverse flows lost 120hp and the glass packs 80. Baffles are tunable for both sound and flow if you uncap and or cut them.
Thread Starter
Racer
Joined: Jun 2022
Posts: 482
Likes: 202
That is some crazy power loss. My 427 just cam e off the dyno last weekend at 445hp and 483 ft.lbs and not looking to give away too much of that.
Le Mans Master
Joined: Mar 2001
Posts: 6,240
Likes: 1,013
From: Watkinsville, GA and Glen Cove, NY
Burning Brakes
Joined: Jan 2006
Posts: 1,088
Likes: 181
From: NC
2022 C2 of the Year Finalist - Modified
What was the loss with the STS baffles from open headers? I talked with Jim a couple months ago and agree he's a great guy to talk to.
Le Mans Master
Joined: Mar 2001
Posts: 6,240
Likes: 1,013
From: Watkinsville, GA and Glen Cove, NY
I think it was only 12 horsepower uncapped on the chassis Dyno, right after the aforementioned tests of the reverse flows and glass packs. They sounded great as well. I would have to check the old Dyno sheets, but 12 is what I think I remember. Later on I did some testing on an engine Dyno. The engine had been reworked and was making 614 hp and I ended up cutting the baffles down to 5 baffles and uncapped, and they lost less than 10hp on that 614hp engine. They were very loud that way however.
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Race Director
Joined: Jan 2005
Posts: 11,050
Likes: 166
From: Milford Michigan
They should drop right in. Do like the Classic Chambered inserts - they have 3 or 4 small longitudinal cuts in each end, on the bell. You bend the metal outward slightly at the cuts so it automatically sizes itself to your pipe when you push the insert in. Presto, no rattling or moving around.
Last edited by Chambered; Mar 7, 2024 at 05:41 PM.
Drifting
Joined: Nov 2007
Posts: 1,716
Likes: 279
From: New York
I agree. Although not a Corvette, I had the Hooker sidepipes on a 1977 Pontiac T/A that I owned back then (Hooker made then for a number of GM cars, not just 'Vettes, back then) Installing the sidepipes on a car that originally came equipped with a single exhaust, choked down by one of the "old style" catalytic converters, made a huge difference in the performance....like night and day. However, I initially used the "glasspack" inserts, and after a summer of driving with them, I got a little tired of the noise level.
I removed them, and installed a pair of the "reverse flow" inserts, and while they brought the sound level down to something more acceptable, their flow restriction did make a noticeable difference in performance.
I removed them, and installed a pair of the "reverse flow" inserts, and while they brought the sound level down to something more acceptable, their flow restriction did make a noticeable difference in performance.
One is quiet. But to be quiet, it is VERY restrictive.
The next one (like a glass pack) is more free flow and allows more noise.
The next one is Hooker Max Flow Side Pipe Mufflers. The least restrictive and so loud you will have to shout in the passengers ear.
There are also other aftermarket side pipe inserts, which I will not address as I had not used them. I have had all three of the Hookers. The restrictive ones just killed the HP. The next one, like glass packs still had a noticeable loss of HP but not too bad. The Max Flow were like running open headers power wise, but I couldn’t take the noise (I’m getting older). My issue was that I wanted to do track events at Lime Rock that has sound restrictions.
Instructor
Joined: Dec 2011
Posts: 197
Likes: 27
From: New Jersey
I used glass pack in inserts in my hookers and couldn’t be happier with the sound. Cruising on the highway the noise level is not what you would think. No problem listening to the radio and talking to the wife. Stomp on it and it really wakes them up😁