Coroplast would have a corrugated edge. Sheet styrene is available at hobby shops.
The diffuser could have 'ears' that stick up into the wheelwell. Is there any room between the bumper and that red bulkhead?
Quote:
https://cherrybombusa.com › glasspack-mufflers.html
Cherry Bomb Glasspack Mufflers
Cherry Bomb Glasspack Mufflers have been around since 1968. It is a legendary high-performance muffler design that let Cherry Bomb take the stage. MUFFLERS; ... Cherry Bomb: 87522 Glasspack Muffler: Dimensions (L x W x H): 13.8 x 4.3 x 4.2 inches: CHECK PRICE: Inlet Size 2.5 in: Thrush: 24214
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