 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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| brant |
Jun 21 2025, 11:30 AM
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914 Wizard Group: Members Posts: 12,010 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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If you have the late style where the short header points to the front of the car and then does a 180 turn to go out the back
That 180 is resrictive The 1.7 being straight to go back is less restrictive and will give you a couple of hp The 2.0 (or SSI brand for a 1.7) has bigger diameter tube and will give a couple more hp over a stock original heater box |
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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
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
Dave_Darling The official power figures are the same for the 74... Jun 23 2025, 11:56 PM |
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