Resonator Delete, Good? Bad?

[Chase300]

Originally Posted by topfuel67

What people don't realize (I was one of them when I did the suitcase delete) is this isn't your 60s muscle car where you can stick the fattest pipe and biggest mufflers to get the best performance. The exhaust needs to be tuned to this car. I've personally seen the magnaflow system gain hp on the dyno.

Actually, I would argue its pretty much just like a 60's muscle car, which had a carb. and not fuel injection. You have to tune the engine just like the 60's engine to see the gain from the increase airflow. With the 60's muscle car, you would change the jets in the carb and take plug readings and even adjust the timing. With the Hemi, you will have to also adjust the fuel and possibly the timing as well, except you will use a computer to input a new fuel curve.
Remember, an engine is nothing but an airpump. The more air you can pump through it the more power you will make.
Because we have a speed density operating system, the Hemi is limited to its adjustments to increased airflow. It can't compensate like a Mass Airflow system can. If the magnaflow system is making more power than stock, yet a suitcase delete is making less than stock, then I would say the suitcase delete has increased the airflow rate beyond what the speed density system can handle and once tuned, ie. reprogrammed, it should yield a larger power increase than the magnaflow system.

[T.A.Miller]

Ok I may be puting my foot in my mouth with this being my first post on this forum and I may be off topic here but am I to understand that unless you retune the car, intake and exhaust don't really make a difference? If I put the intake and exhaust off of an SRT8 would it make a difference without tuneing, or at all?

[jizzajames]

good.... and cheap

[topfuel67]

Originally Posted by Chase300

Actually, I would argue its pretty much just like a 60's muscle car, which had a carb. and not fuel injection. You have to tune the engine just like the 60's engine to see the gain from the increase airflow. With the 60's muscle car, you would change the jets in the carb and take plug readings and even adjust the timing. With the Hemi, you will have to also adjust the fuel and possibly the timing as well, except you will use a computer to input a new fuel curve.
Remember, an engine is nothing but an airpump. The more air you can pump through it the more power you will make.
Because we have a speed density operating system, the Hemi is limited to its adjustments to increased airflow. It can't compensate like a Mass Airflow system can. If the magnaflow system is making more power than stock, yet a suitcase delete is making less than stock, then I would say the suitcase delete has increased the airflow rate beyond what the speed density system can handle and once tuned, ie. reprogrammed, it should yield a larger power increase than the magnaflow system.

My friend has a 300c srt8 with the magnaflow. When I had the suitcase delete we both had the same CAI. I ran a 13.39 to his 13.13 at Bakersfield side by side and this was prior to the Diablo being released in May 2007. I knew my car was down 20hp from stock and the track proved it, so I put my friend's stock exhaust on my car to get rid of the suitcase delete. Go forward to January 2008 when we both got our cars dialed in on the same dyno the same day. Same CAIs, both with a 185 tstat and only difference is my exhaust is stock and he has magnaflow. He made about 10 more hp than me baseline and made about 14 or so more hp than me once dialed in. The guy running the dyno compared AFR and put my friend's setting at 14/15/15% rich and mine at 13/13/13% rich. He commented the magnaflow were flowing better.
While I agree that the car HAS to be tuned to the exhaust, its not just about sticking fat pipes on or the least restricting muffler at a random point. The center muffler is an expansion chamber, the x pipe is set up to scavange exhaust and the distance the exhaust waves travels in each pipe/muffler has an effect on the output.

[T.A.Miller]

Wow thanks for the great info TopFuel I appreciate it.