 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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| Dave_Darling |
Jun 23 2025, 11:56 PM
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914 Idiot Group: Members Posts: 15,196 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The official power figures are the same for the 74 1.8 and the 75 1.8 . I don't buy that, personally.
On the 2.0 cars, the 75 has 7 fewer HP than the 74 does. 95 HP -> 88 HP. The 75-76 2-liter cars used exactly the same exhaust as the 75 1.8 cars did. I would expect between 4 and 7 HP difference on the 1.8 motors (the 74 1.8 was rated for 76 HP), but I don't have any actual data to back that up. Or, come to think of it, any back-to-back experience. --DD |
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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 bdstone914 1974 1.8L stock heat exchangers have the same size... Jun 21 2025, 07:25 PM rick 918-S The other issue is heat from the case manifolds. H... Jun 22 2025, 10:02 AM
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