72 RS Prototype Hot Rod Build!

[Bert]

No, didn't try a different air box because this is what I'm going to run. Foam filters would be too tall the fit under the engine lid so this SCRS style air box is what will fit. I also dig the look of it. All the gains from the first pull were achieved by changing to a dual out muffler. I was going to run the Dansk single out sport muffler but it sucked on flow. We next tried the Scart single tip muffler and it was a 10-12 HP increase. Then we tried a dual out sport muffler and had a big jump to 20HP increase. Then we used a dual out R style muffler and got the final result of a 30HP gain. So, I'll be using the dual out R style muffler instead. My heads have been ported so they flow a lot of air so needed the muffler to do the same. I could get even more gains probably if I went to 1 3/4 headers but I'm going to use the new larger SSI's. I like the look and function of them and am very happy with the HP and Torque.

Was the dual out R style muffler the loudest muffler in your testing? Is the sound bearable for street driving?

[Longballa]

The pea shooter was the loudest but I don't like the look and sound of those. The R sounds great. You'll hear it at Rennsport. It's definitely good for street. I have no radio so it's all engine music for me. I'll have to see which sound I like the most the intake, exhaust or short gears. I did keep the factory sound deadening in so that will help. I'll report back on the sound when I drive it home from Rothsport.

[RTincher]

Excellent design and results Scott, definitely worth the wait and the upgrade. Was Jeff satisfied, or was he still looking for more performance?

Would you post a picture of the R muffler if you have one?

[Bert]

The pea shooter was the loudest but I don't like the look and sound of those. The R sounds great. You'll hear it at Rennsport. It's definitely good for street. I have no radio so it's all engine music for me. I'll have to see which sound I like the most the intake, exhaust or short gears. I did keep the factory sound deadening in so that will help. I'll report back on the sound when I drive it home from Rothsport.

I look forward to seeing and hearing your car at Rennsport.

Cheers,

[Longballa]

Excellent design and results Scott, definitely worth the wait and the upgrade. Was Jeff satisfied, or was he still looking for more performance?

Would you post a picture of the R muffler if you have one?

347.4 HP from a 3.5L yes he was happy as am I.

[Longballa]

As my 72 gets closer to the finish line I contemplate selling my 87 hot rod and then I drive it. 2500 lbs 3.4L twin plug, short gears, aluminum pressure plate, 930 brakes, blows ice cold A/C. Power windows and central locking. Remind me to never sell it. It's bad to the bone.

[NoH2O]

great results Scott...its going to be amazing once on the road!

[Longballa]

SSI dual out muffler.

[Longballa]

Well guys, I tried my best to bring the car to Rennsport but I'll be driving the 87 hot rod. Drove the 72 home today which was amazing! Car is stupid good but when I got home I noticed a transmission leak that needs repair before a trip like Treffen and Rennsport. I'll bring it to a California event next year.

[rgupta250]

Smart decision, Scott!