Flowmaster Standard 40 Series Mufflers

 

The American Thunder 40 Series is the most aggressive sounding street and strip muffler in Flowmaster's product line. The 40 Series will generate extreme interior resonance within the vehicle. If you want to really hear your exhaust system inside as well as outside your vehicle the 40 Series is for you.

 

 

Application Recommendations:

• Off Road and Race applications
• Aggressive Tone for Early Street/Strip Cars
• Early Generation Muscle Cars
• Vehicles with dual exhaust

40 SERIES STANDARD 4" CASE                                        4" X 9.75" X 13" - 19" OVERALL LENGTH
In/Out       Part Number	In/Out       Part Number	In/Out       Part Number
2.25"            42441	2.25"           42443	3.00"/2.50"      430402
2.50"            42541	2.50"           42543
3.00"            43041	3.00"           43043