 Any HP gain for early 1.7 heater boxes and Bursch muffler vs late 1.8 system? |
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| 914rrr |
 Jun 21 2025, 11:09 AM
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Senior Member  Group: Members Posts: 1,908 Joined: 1-July 03 From: Knoxville, TN Member No.: 874 Region Association: South East States  |
I have a 75 1.8 with the OE heater boxes and a Bursch muffler w/o cat.
Is there any HP gain if I were to switch to an earlier 1.7 heater boxes and Bursch muffler? Another alternative is to use a Supertrapp muffler with the late 1.8 heater boxes. |
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| bdstone914 |
Jun 21 2025, 07:25 PM
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bdstone914 Group: Members Posts: 5,031 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
1974 1.8L stock heat exchangers have the same size pipes as the 73-74 2.0L.
SSI all use the larger pipes. In theory yes. How much? Had to be tested. I would not expect much difference on low HP engines If you switch go with SSI or 2.0 73-74 or 1974 1.8 stock. I am not a fan of SSIs. Especially with the Dansk Kuality. They were better when made in California |
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Posts in this topic
914rrr Any HP gain for early 1.7 heater boxes and Bursch muffler vs late 1.8 system? Jun 21 2025, 11:09 AM
brant If you have the late style where the short header ... Jun 21 2025, 11:30 AM 914rrr Thanks! Are we talking 2 HP add or 8 HP added,... Jun 21 2025, 04:01 PM rick 918-S The other issue is heat from the case manifolds. H... Jun 22 2025, 10:02 AM
Dave_Darling The official power figures are the same for the 74... Jun 23 2025, 11:56 PM |
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